About animals

Cockerel fish: diseases and treatment methods


Low water temperatures can cause shock to the aquarium inhabitants. The fish become lethargic, move slowly, as if in a dream, or lie on their side or bottom or occupy an upright position and sway. Some have a sharp decrease in appetite, while others completely refuse to feed. Their respiratory function decreases, which can be seen by the slowdown of the gill covers. Fishes have to deal with low temperatures when transplanting from one aquarium to another, and when equipment fails, which is responsible for maintaining the water temperature in optimal condition. You can correct the situation and improve the health of the fish by raising the water temperature to the desired level.

The high temperature of the water, on the contrary, makes the fish overly active. They rush from side to side and even jump out of the aquarium if it is not covered by a lid. These painful symptoms occur when transplanting fish from an aquarium with a normal temperature for them into an aquarium with an elevated water temperature. You ask, what about if the need to keep fish in warmer water is dictated by their treatment for parasites? In this case, take care of good aeration - it will greatly alleviate the painful condition of your pets.

A deficiency of oxygen in water makes it difficult for fish to breathe and causes them to rise to the surface and swallow atmospheric air containing oxygen. If the fish live for a long time in conditions of lack of O2, their gill caps protrude, they stop eating, their growth slows down and their ability to reproduce is lost. So that the fish in the home aquarium do not get sick from lack of oxygen, it should maintain the right proportion between the volume of the tank, the number of plants and the number of inhabitants, take care of the hygiene of the aquarium and regularly change the water.

Oversaturation of water with oxygen causes clogging of blood vessels by O2 bubbles in fish, that is, gas embolism. The behavior of diseased fish becomes shy and alarming. Their body trembles as if in convulsions, and the covers of the gills move slower at first, and then completely stop moving. In some fish, from an excess of oxygen in the water, connective tissues begin to break down, scale to brush, and the cornea and lens of the eye become cloudy. The causes of oversaturation of water in an aquarium with oxygen are usually too powerful aerator, too bright light and too dense vegetation. To rid the fish of gas embolism, you need to bring all this back to normal and maintain it in optimal condition.

A pH below the norm (reduced acidity of the water) leads the fish to a less mobile state and makes them too shy. From active they turn into amorphous: lie on their sides or swim upside down. Their color fades noticeably and light spots appear, the gills are convulsively compressed, and in some species the tail fin is also destroyed. If you do not take urgent measures - raise the pH to 5.5 units - the fish will hide among the plants and soon you will find them dead there.

A pH above the norm (increased acidity of water) makes the work of the respiratory system in fish more difficult - it becomes more frequent. At the same time, movements are coordinated (the fish rushing to and fro and even jumping out of the aquarium) and convulsions begin. The color fades, the body becomes covered with mucus, the fins puff up and exude mucus. If all these painful symptoms are ignored, the next stage in the development of the disease will be clouding of the cornea and blindness. Increased acidity (up to 9 units) is typical for aquariums with acidic water, an abundance of plants and light, overpopulated by inhabitants. If all this is corrected in time and then constantly maintained in this state, the pH will return to normal and threats to the health of the fish will disappear.

The presence of chlorine in water is the cause of the disease in aquarium fish, the symptomatology of which is manifested in a change in their behavior (they have anxiety and a desire to jump out), in a change in appearance (the appearance of mucus first on the petals of the gills, and then on the whole body). With the further development of the disease, the fish become indifferent to all external stimuli and become passive and suddenly die. How to prevent a disease caused by Cl gas? It is necessary either to defend tap water intended for a change of at least two days, or to heat up to 70 degrees, cool and immediately use. We especially recommend that we take this into account in the spring months, because during this period there is a lot of chlorine in the water.

Diseases in fish that cause mechanical damage

In an aquarium, fish live, albeit in an artificially created, but still imitating natural space. Naturally, anything can happen to them in this space, therefore they are not insured, including from receiving various kinds of mechanical damage. They acquire them in battles with other fish in the aquarium, in the aggression of more vicious species of fish, in a collision with the sharp corners of the scenery and sharp leaves of hard plants.

One way or another, the inhabitants of home aquariums get all kinds of wounds, cuts, bruises, injuries, cliff fins and so on. Under normal conditions, all these lesions heal quickly due to the ability of tissues to regenerate. However, if the water in the aquarium is far from ideal in its hygienic properties, then you cannot count on the correction of injured fish. The fact is that damaged areas on the body of fish begin to colonize fungi and harmful microflora. Through them, various infections and parasites penetrate the fish organism. In the event of a negative development of events, sick fish should be treated with Bicillin-5 preparation in the calculation from 3000 to 5000 units per 1 liter of water. However, prevention in the form of regular cleaning of the aquarium and water changes will not lead to complications.

Infectious fish diseases

  • in macropods (the genus Macropodus has 9 species of fish), for example, the symptoms of the disease are manifested in the appearance of redness on the skin at the sites of lesions, in raising the scales and falling out, possibly the appearance of black spots on the body, the development of buccalis and eyesore,
  • in zebrafish with a disease of microbacteriosis, the abdomen swells and develops eye-eye, leading to loss of eyes from the orbits,
  • in other cyprinids (goldfish, barbus, cardinal, labe, parsing, etc.), growths with a curdled mass appear inside the body cavity, which protrude from the outside in the form of bumps on the skin. In representatives of this species of fish, microbacteriosis is otherwise called "curdled carp disease",
  • In cockerels, the symptoms of tuberculosis (aka “cockerel ascites”) are manifested in a gradual increase in the abdomen and stretching of the skin to the point that after a maximum of two months the representatives of this fish species literally become transparent. The disease makes them passive, turns them on their side or upside down. If they make movements, then they do it unusually abruptly. The males refuse to eat
  • in pecilli fish (limia, molliesia, etc.), diseased individuals are kept apart, refuse food and are quickly exhausted. Because of this, the abdomen is retracted, the spine does not naturally bend, the eyes sunken, a skeleton appears through the skin and scales.

There is no way to treat microbiosis at this stage. However, the disease can be prevented. Preventive measures are harsh but effective. Having noticed the fish with the above symptoms, catch them from the aquarium and destroy them, clean and disinfect the aquarium, neutralize the plants.

Saprolegniosis or otherwise dermatomycosis provokes mold fungi Saprolegnia and Achlya. This disease is manifested by the appearance on the body, gills and fins of plaque, similar to cotton wool. Prevention is common.

Byssus is a fungal disease of caviar caused by mold fungi of the genera Saprolegnia and Achlya. The fungus occupies, first of all, dead non-fertilized and with a deficiency of yolk caviar. After this, the fungus, growing, affects the fertilized eggs. The fungus entangles them with hyphae (white threads) and deprives them of oxygen supply. As a result, the kinks die. To prevent the development of byssus, spawning should be regularly cleaned of organic matter (food debris, waste products of the aquarium inhabitants, dead eggs). You can prevent further death of calves. To do this, you need to regularly replace part of the water in the aquarium, reduce its illumination and install a good aerator.

Branchiomycosis is caused by a fungus of unknown origin. This disease makes the fish indifferent to what is happening around. They sink to the bottom, clog into the corners or stand head down. There are totally refuse. Gills change their usual color to mosaic, in which burgundy and gray colors alternate.

Kostiosis is the result of damage to the skin and gills of fish by the flagellum Costia necatrix. Fishes lose peace, constantly itch on decoration items and plants, do not take food. A little later, due to the abundant secretion of mucus, the body becomes covered with spots, which eventually merge into a solid gray or bluish coating. In some species of fish, the interradiation tissue is destroyed on the fins. Bones die if you raise the temperature of the water in the aquarium to 32-34 degrees.

Octomitosis, the causative agent of which is the flagellate Octomitus truttae, is characterized by the following symptoms: severe exhaustion in the presence of appetite and good nutrition, inflammation of the anus, partial prolapse of the rectum, and sometimes the bladder.

Oodinumosis. Another name for this disease, the causative agents of which are flagellates from the genus Oodinium - "velvet disease" or "gold dust." Its main distinguishing feature is the appearance on the body of micronodules in the form of golden or gray dust. At the beginning of the disease, the fish only occasionally scratch themselves on the interior of the aquarium. As a result of further invasion, the external integument is exfoliated by flakes, interradiation tissue is destroyed on the fins, mucus is liberated liberally, leading to a deterioration in gas exchange. An interesting fact: the sick fish does not leave the appetite until death.

Neon disease (aka plethophorosis) is caused by the amoeba-shaped sporovich Plistiophora hyphessobryconis. In the neon affected by it, the longitudinal strip fades, and in other species of fish, the color simply loses its brightness. The disease develops as follows:

  1. Fish lose their inherent coordination,
  2. When swimming, their tail drops to 60 degrees, but the fish try to regain balance periodically jumping,
  3. Refuse to eat,
  4. constantly moving at night
  5. die because effective treatment does not yet exist.

Various types of sporonitis are the causative agents of such dangerous diseases as glugeosis, nodular disease, etc.

Common contagious diseases also include:

  • Those that cause ciliates (ichthyophthyroidism, chylodonellosis, trichodinosis),
  • Those whose causative agents are monogenetic flukes (dactylogyrosis, gyrodactylysis),
  • Those whose causative agents are diagenetic flukes (sanguine fever, diplostomatosis),
  • those whose reason is copepods (lerneosis, etc.),
  • those that cause gill tails (argulosis).

Disease prevention

These lovely fish suffer from bacterial and parasitic diseases. To understand that a pet is sick is simple: a fish hides at the bottom, refuses to eat, becomes covered with white and white spots, its color changes, its fins are affected.

Let's see what causes the diseases of the cockerel fish:

  1. Low water quality (fraught with decreased immunity and death of fish),
  2. Expired poor-quality feed (immediately uneaten)
  3. Garbage. Depending on the displacement of the aquarium, it is necessary to stably clean the aquarium once a week and change about 1/3 of the water,
  4. Inadequate filtering
  5. An excess of pets in one tank,
  6. Plants from other bodies of water,
  7. The impossibility of spawning (females fall ill with oncology, males become sluggish),
  8. Avitaminosis.

Have you noticed the same symptoms in several fish? Check and change the water, install additional aeration, perform the disinfection procedure. Worse, if only one of the fish is sick: this indicates the onset of a bacterial illness, fraught with negative consequences. Let's look at what diseases of aquarium cockerel fish arise, and find out the main symptoms.

Fin rot

The reason is the bacterium Pseudomonas, which fell into the water along with food or new inhabitants. Usually she clings to young or weakened individuals, but if untimely detection is able to destroy the entire population of the aquarium.

  1. Lethargy.
  2. A sudden change in color.
  3. Ulcers or bluish plaque on the body.
  4. Corneal clouding.
  5. Blowing bubbles
  6. Ugly, downward, sticky fins.

Found one or more signs of fin rot? Begin immediate treatment and quarantine the diseased fish until complete recovery, otherwise it will infect other pets.

Most often, specialists treat a cockerel with a streptocide or other antibacterial agent. So, treatment of cockerel with metronidazole gives a quick effect and improved health.

In addition, you can use special products sold in pet stores.

In addition, treatment can be carried out with the following drugs:

  1. Bicillin-5 (penicillin substance of bactericidal action).
  2. Biomycin (a broad-based antimicrobial antibiotic).
  3. Malachite green. Treatment is carried out for a maximum of five days (gradually increase the dosage from 0.5 to 0.7 ml). Only freshly prepared solution is used, the processing process takes five hours.
  4. Violet K (hydrochloride). The substance is diluted in proportions of 0.1 grams per liter. Having directed 15 ml of the solution, add it to 15 liters of water and pour it into the aquarium.

Antibiotics give a couple of months (per 100 liters the norm is 20 grams).

Remember that diseases in fish proceed very quickly: sometimes the count goes literally on the clock. If you doubt the correctness of the diagnosis, you should contact the veterinary clinic or the employees of the Pododniy Mir pet store who will tell you the ideal medicine and help you choose the right dosage.

Ichthyophthyroidism (semolina)

Have you noticed nodules or white vesicles resembling lumps of semolina on the fish’s body? Your pet is unhappy with the temperature of the water or the dirt, so she caught the infection caused by the infusoria-ichthyophthirius. The signals are as follows:

  1. Lack of appetite.
  2. Slow breathing
  3. Lack of coordination of movements.
  4. Decreased activity.
  5. Weight loss.

In addition to bicillin-5 and tripaflavin, it is worthwhile to treat the cockerel in a salt bath.

Saline treatment for fish

The treatment is carried out as follows:

  1. We transplant the cockerels into a separate container.
  2. We take pure salt, dissolve in warm water (2 tablespoons of sodium chloride per 10 dm3).
  3. Turn on the aerator for 20 minutes.
  4. We start the fish (if you lie sideways, you need to dilute the mixture).

Often, such a medicine for cockerel fish is enough to heal any infectious ailments.

Exophthalmia (eye-eye)

If you find such a change as eyebrows in cockerel fish, this is a viral infection that is treated with Epsom salt (magnesium sulfate) and Ammonium minus treatment.

The surface of the eye becomes cloudy, is wrapped in a white film, the eyes can crawl out of the orbits: in the most severe case, the cockerel will lose its organs of vision and die.

Noticing that the cockerel fish became sad and your eyes became white - take measures (a favorable outcome depends on the timeliness of the detection of the disease).Replace water, reduce food intake - if the source is the wrong conditions, then bloating will pass quickly.

These measures did not help, did others begin to appear infected with gray plaque on the body and shortness of breath? Put them in a plastic container, use ointments and antibiotics.


If you notice that the fish’s cockerel has a bloated stomach, the treatment will be effective only at the very beginning of the disease. Dropsy is a very serious disease. There may be many causes, it is important to find the source in time, and consult specialists in a timely manner for diagnosis. You can independently determine it by the following signs:

  1. An enlarged abdomen.
  2. Red spots at the base of the fins.
  3. Refusal to eat.
  4. Bruising on the body.
  5. Swollen eyes.
  6. Fast weight loss.

Keep in mind that in such a situation, complete disinfection, replacement of decorative elements, plants and other attributes is necessary.

Oodiniosis: fused fins

In case of "velveteen disease", the main manifestation is the presence of a light yellow coating on the body. There are other characteristic features:

  1. Breaking and splitting scales.
  2. Loss of color brightness.
  3. Apathy.
  4. Labored breathing.
  5. Deceased fins.

Appears as a result of poor care, hypothermia, the sharing of individuals that have not been quarantined.

For treatment, antibacterial agents are used:

  1. Antipar (antiseptic acting on the fungus).
  2. Seraoodinopur (water condenser).
  3. Formamed (a drug against invasive diseases and maintaining a healthy environment).
  4. Ichthyopho (a substance based on two septic tanks: formalin and malachite green).

Please note: if at least one individual experiences malaise, a complete disinfection and treatment of the rest is mandatory. Otherwise, underwater charms will infect each other, and the disease will drag on indefinitely.

Maintain an elevated temperature of water during quarantine.


If the cockerel is swollen near the gills, there is most likely a “mouth fungus” that appears due to overpopulation, a high concentration of organic matter, and untimely feeding.

You can detect the disease by the following signs:

  1. Lethargy.
  2. Desire to hide in a secluded place.
  3. Dark coating on the gills.
  4. Damage to the mouth.
  5. The appearance of turbid fluid in the eyes.

They begin treatment of the fungus in cockerel fish with the use of complex preparations, the use of disinfectants, and baths with phenoxyethane. Some advise adding methylene blue or Merbromin, which contribute to a quick recovery.

Have you noticed that one or more pets are unwell? Now you know what diseases the cockerel can pick up, and you can easily find the appropriate medication.

Can't diagnose the disease? There are many photos on the Internet that help to establish and select effective treatment during a consultation with specialists of the Underwater World company.

Why is aquarium fish sick?

Diseases of fish are quite rare cases, but they are most discussed. Most of the "diseases" and "problems" with the fish are contrived. It seems to a person that the fish is not swimming that way, not growing so much, not of the same color, not eating that way, and he is running along the forums to treat her. And on the forums there is a support group that has read a bit and is beginning to actively scatter tips.

2 photos of guppies. Here is the one in the first photo, it may seem sick. Very often, people “think” that the fish is no longer swimming, not so colored, and in general “everything used to be different before”. The difference here is that the first is grown at high temperatures. She is elongated and lives less. Therefore, even a person who has been engaged in fishing for decades may not know this difference.

1. the cause of the death of the fish is a lack of oxygen. She gasps. This happens when you take a fish for a long time in a jar, especially if you pick up a full jar without leaving an air gap. The second - you are a fish, when you clean the entire aquarium with washing stones, put it in a bucket and it lacks oxygen there. Next - release the fish from the package. They took water in a bag and left it to swim. There, too, sometimes the fish suffocates. Following are tall and narrow septic aquariums. There is always little oxygen, especially if the fish is demanding on it. There is a separate article about oxygen in the aquarium, and I will not describe all the nuances here.

2. the reason is ammonia poisoning. To put it bluntly, I was poisoned by my poop. Pretty common reason. It happens again with a large amount of feed. Overdid it. Well, with overpopulation and poor filtration. All filtration in the aquarium is designed to remove ammonia. If she does not cope, trouble happens. And yet - these 2 reasons are pretty much related. After all, ammonia also devours oxygen to become less toxic. In these cases, there are so-called “chain reactions” when one fish dies, and after it all the others begin to die very quickly. You can read about filtration in the aquarium here.

3. the reason is temperature. Her indicator is all underestimated. A fairly common reason for the death of fish is when they are either cooked or supercooled. The fish does not withstand sudden jumps in temperature. So you have to be very careful with her. About the temperature of the water in the aquarium.

4. the reason is a lot of fresh water during the change, especially in the spring, when the water "blooms". Or in general, when it is not replaced for months, but only topped up. Then the fish dies for no reason.

5. the reason is the treatment of the fish. The fish does not die from treatment, but from the fact that the poisons in the aquarium kill all living bacteria, make the aquarium "dead." For a decorative aquarium, a problematic situation. If at wholesale you can treat a fish, make the aquarium “sterile”, and then just change the whole water and washcloth, then this does not work in decorative ones. Anyway, from this "sterility" the fish will die later.

6. the cause is illness. This happens all the same quite rarely, but is most remembered. From diseases, too, the fish dies. But the disease shows that somewhere you are doing something wrong with the aquarium. Somewhere you are not paying enough time or incorrectly organized the aquarium. So here the best technique is to try to create a normal aquarium, rather than asking which pills are best. Pills will remove the symptoms, not the cause. Many owners of aquarium fish have faced such a nuisance as their disease. But this is quite common, because fish, like any other living organism, are susceptible to diseases. With proper care of them, you can easily avoid this trouble, but you need to not only change water and feed them regularly, but also monitor their condition.

How does the infection occur?

Aquarium fish are infected due to the parasitic effects of the flagellate. He has an oval body, drop-shaped, at the end of which there are several flagella, with which the parasite is fixed on aquarium fish. The length of this reptile is no more than 13 mm. The danger of the disease caused by this microbe is that the skin of the fish is gradually destroyed, as a result of which there is an abundant secretion of mucus. Such parasites prevail in almost all species of fish. They can be attached to their skin, but this does not stop the fish from looking healthy. This is because a kind of push is needed to initiate infection. So, if a fish experiences stress, its immune system weakens, and the disease begins to progress at a very high speed. There are several reasons for the appearance of a parasite in an aquarium. Most often, reptiles get into your jar using gravel or plants brought from street ponds. Infected fish or food for them can also be a way for the flagellum to enter the aquarium, because the seller, of course, will not tell you that the fish are sick. However, it is not necessary to go somewhere to bring the ailment. There are times when parasites appear if the water in your aquarium is very stagnant. An acidic environment and a strong increase in water temperature contribute to their development. The disease can progress at any time of the year, however, most often the disease manifests itself in the summer, because it is then that the microbe grows rapidly and it gets to you using live food such as bloodworms or pipe maker. In order to survive the parasite, it is necessary to attach to the fish within a few hours, otherwise the microbe will die. This fact must be taken into account when fighting flagella. If you notice that several of your fish are sick, then catch them and place them in another jar with a water temperature of about 30 degrees. There they must sit for 2 hours. This method will help you get rid of the pathogen without any problems. Some aquarists advise treating aquarium pets in warm water, because if the water temperature is from 30 to 32 degrees, the parasite dies. Of course, this seems a little strange, because optimal conditions are created for the existence of the microbe. In fact, all these actions are performed so that the reptile loses its teardrop shape and becomes round. In this state, it is more difficult for him to move, but he can remain fit for a long time. When a microbe gets into optimal conditions for him, he tries to find a new victim for attachment to it, but he does not have enough strength and energy for this. If he still managed to stick to some fish, then he immediately begins to multiply rapidly. After a short period of time, you will see a lot of flagellates on the gills of the diseased fish. They irritate the skin tissue and gills of the victim, which gradually begin to secrete a large amount of mucus, and this is good nutrition for germs. For fry, boneosis is much more dangerous. The immune system of young animals is weak in itself and it is easier for a parasite to kill such individuals. Adult fish rarely die from this disease. They are more carriers of the disease. Nevertheless, if the fish cannot be cured in time, your aquarium will be replenished with a small corpse.

Symptoms of the disease.

First of all, irritation of the fish epithelium begins, while its behavior changes. She often begins to rub against aquarium soil or plants and stones. Further, there is a rejection of food and complete indifference to external stimuli. Then the breathing of the infected individual becomes difficult even with the optimal amount of oxygen in the water. If you look closely, then at the base of the tail and on the ridge of the fish you can see a plaque, bluish in color. Over a short period of time, the parasite victim begins to swim poorly due to glued fins. The most severe stage of the disease manifests itself when abundant secretion of mucus occurs. In this case, the skin becomes more dull and sometimes exfoliates in whole pieces. The infected fish begin to become covered with grayish spots, which gradually fill the whole body of the fish. A characteristic indicator is the bulging of the gill covers of the fish. If you look at it from above, you can easily notice it. A thickened mass forms in the gills, which tightly closes the respiratory gap. As a result of this, the gills begin to turn pale, lose their natural form and become numb. Oxygen begins to be poorly absorbed due to the large amount of mucus. Gill necrosis forms.

What fish diseases exist?

Diseases of aquarium fish can be divided into several types:

  • Infectious diseases of fish caused by fungi, viruses, bacteria.
  • Diseases of physical and chemical origin.
  • Ailments due to poor nutrition, poor aquarium care.
  • Diseases of fish are invasive.

Watch the video about the worst diseases.

Variety of diseases

Diseases of fish that are not transmitted to other animals:

  • Alkaline disease of aquarium inhabitants results from too soft alkaline balance of water. With excess light, a large number of plants, the water begins to sour, which becomes the cause of infection with alkalosis.
    The first symptoms of the disease are loss of color of the scales, fins spread wide, a large amount of bloody mucus is released from the gills. When moving, animals have a cramp. They jump out of the tank.
    With the advanced course of the disease, the optic cornea becomes turbid in animals, which subsequently leads to blindness. Aquarium fish most often die, it happens at night.
    You can get rid of the disease by transplanting animals into a container of water, the alkalinity of which is in the range of 7-8.5. At this time, the desired balance of acidity in the common tank should be established.
  • Argulez or "fish louse." The disease is caused by a parasite - crustacean carnivore. Symptoms of the disease are swollen wounds with red scales inflamed along the edges of which mucus constantly oozes. This happens due to the introduction of the parasite into the tissue. The fish stops eating. In an affected place, it constantly itches on solid decorations. Once inside the fish, the crustacean constantly releases a substance that leads to poisoning of the animal.
    In order to cure an individual, a crustacean should be removed from it. To do this, they catch it, wrap it with a soft cloth and use a pair of tweezers to pull out the parasitic crustacean. The affected area is treated with a solution of potassium permanganate.

  • Choking occurs due to the habitat of animals in the tank, poorly saturated with oxygen. The first signs are the opening of gill organs, a diseased fish swims near the surface.
    The first step on how to treat fish is to transplant them into a container with a good aeration system. At the same time, an oxygen balance is established in the common tank, spring cleaning is carried out, food residues are removed and the soil is siphoned.
    Symptoms are similar to some types of infectious diseases. At home, a diagnostic procedure is possible by normalizing the oxygen balance. If the animals recover, it means that they suffered from asphyxia.
  • Ammonia poisoning occurs as a result of oversaturation of the aquarium with plants, invertebrate species of animals, as well as due to the accumulation of a large amount of fish waste. External signs of the disease are changes in the color of the scales to a darker one. In this case, the fish swim close to the surface of the tank, often they try to jump out of it.
    Of the therapeutic actions, the first thing to do is to change 50% of the water, reduce the concentration of ammonia and nitrates and normalize the filtration, thoroughly clean the aquarium of debris and food debris.
  • An acid illness results in a decrease in pH due to the spawning period of fish or the emergence of new animals. You can understand the presence of the disease by lethargy and alertness of individuals, white spots, mucus appear on the scales. The movements of the fish become chaotic, they swim sideways or upside down.
    Aquarium fish are treated with baking soda, which is dissolved in water to normalize acid balance. Water is also partially replaced by fresh.

  • Problems with the stomach or intestines often arise due to poor quality food, when there is only one type of food in the diet of animals. The brightness of the color is lost, the fish do not move much. Feces with bloody impurities appear, the anal passage is inflamed.
    Aquarium fish treatment is carried out using fasting. For several days they are not fed at all, then a quality food suitable for the given species is gradually introduced.
  • The formation of cysts of the gonads is possible in the case of separately keeping males and females, as well as due to poor nutrition. The abdomen of aquarium fish swells due to the formation of a semi-fluid tumor. She begins to put pressure on all organs. Fish stop eating, become barren, and eventually die. Unfortunately, their treatment is almost impossible.This is due to the fact that it is difficult to recognize the disease in the first stages, and when it is already visible, it is too late to conduct therapy.
  • Dry and uniform food, overpopulation of the aquarium leads to obesity in fish. This can be understood by a sluggish lifestyle, a swollen upper abdomen.
    It is rare to cure obesity, most often the fish dies. Therefore, it is necessary to control the quality of the feed, the amount of feed, arrange fasting days for animals.

  • Chlorine poisoning is possible when replacing water, if you take it from the water supply and do not defend it in advance. Animals in this case swim in jerks, trying to jump out of the aquarium, spend most of the time at the surface of the water. Over time, they cease to respond to stimuli and die.
    Transplant animals into a chlorine-free water tank, and normalize the concentration of chlorine in the tank. You can just leave it for two days, most of the substance will disappear during this time. You can quickly get rid of the problem by heating the water to 90 degrees.
  • Colds are signs of an improper temperature balance; the water for this type of fish is too cold. You can understand this by the sluggish and swaying movements of animals, the scales darken, and the gills become dark. To get rid of the problem, it is enough to raise the temperature in the aquarium to the optimum for the fish of this species.

Diseases transmitted to other animals

  • The cause of the appearance of white skin is bacteria. It enters the tank with new animals, decorations or vegetation. The dorsal and caudal fins become white, the fish is constantly located at the surface of the water. The causative agent bacteria affects the central nervous system, coordination. Possible death of the animal.
    They treat with chloramphenicol, making baths with medicine.
  • Branchiomycosis is caused by fungi that contribute to the appearance of blood clots in the vessels. Red spots appear on the body of the fish. She becomes inactive, stops eating, constantly hides in secluded darkened places. Over time, the tissues on the gills die.
    Animals can be saved if the diagnosis was made in the early stages, otherwise mass death of fish is possible. At the first sign of a sick pet, it is necessary to set it off, disinfect the general aquarium or restart the restart.

  • Hexamitosis occurs due to the parasite of the flagellum in the form of a drop. It leads to exhaustion of the individual, inflammation of the anus, the appearance of feces of white color. Small sores appear on the body. A sick animal quickly infects other fish, so it should immediately be deposited.
    Antibiotics are necessary medications for treatment. They are dissolved in water. In this case, it is necessary to control the nutrition of animals. Food should be varied and contain a large amount of nutrients.
  • Kostiosis is caused by invasion. It enters the tank with infected animals and plants, with live feed. Symptoms begin with the fact that the fish rub against objects in a container. Then the gills are covered with mucus, which leads to shortness of breath, and eventually to a complete stop.
    A sick fish is deposited and treated with the help of baths with a solution of potassium permanganate (a tenth of a gram per liter of water) or a solution of salt (a tablespoon of 10 liters).

  • Dactylogyrosis is caused by parasitic flukes that infect the gills of an animal. It stops eating, rubs against solid objects, eagerly captures air from the surface of the water. Gills become variegated, mucus appears.
    Parasites are excreted after increasing the temperature of the water, adding sodium chloride or bicillin to it.
  • Dermatomycosis occurs due to mold. It can cause damage not only to the skin, but also to internal organs. Diagnosis of aquarium fish diseases for the presence of fungus can be done by inspection. The body of the fish is covered with white threads. At first, organs cease to work, animals then die.
    The fungus is a secondary symptom of the underlying disease, so it should be treated. If the appearance is caused by a weakened immunity, add a solution of malachite green, potassium permanganate or food tar to the water.
  • Ichthyosporidiosis caused by a fungus kills all tissues except cartilage and bone. The fish itches, moves with jerks, refuses food, the eyes bulge out, wounds, tumors appear.

There are no medicines to cure than animals. It dies, while infecting the remaining individuals. They should be destroyed. Restarting the aquarium after fish disease is possible only after disinfection of the tank.

Healthy gold

First of all, let's determine how a healthy goldfish behaves. These hydrobionts lead a mobile lifestyle. Their movements are smooth and often unhurried, but the movement is literally life for the fish! The color of the scales should not change, bright scales without any plaque - a healthy fish. Good appetite - always! These babies have such a voracious organism that they can even die from overeating. Goldfish almost do not feel full, so always do not mind a snack.


Cinderella look pretty strong, but the appearance is misleading. Fish are often injured on the sharp edges of stones, equipment and decorations. Too massive decorations or very cramped grottoes can also cause wounds on the body of the fish. In addition, because of their calm, phlegmatic temperament, gold often becomes the target of attacks for aggressive neighbors.

To treat injuries, wounds and abrasions, we recommend daily water changes. In case of serious injuries, salt treatment helps. For a salt bath, use a small container in which dilute the water from the aquarium with sodium chloride in the proportion: 1 tablespoon per 10 liters of liquid. First, lower the fish into the solution for 1-2 minutes. Then add water from the aquarium to reduce salt concentration by 2 times, in a minute you can return the pet to its native reservoir.

Incorrect aquarium equipment

Among Russian aquarists, Soviet even, the stereotype that a goldfish feels great in a round aquarium is strong. And the equipment is completely useless, well, perhaps the compressor. So this statement is fundamentally wrong, for two reasons:

  1. A round aquarium is an uncomfortable environment in which fish, in most cases, the fish survive, but not live.
  2. Distorting an aquarium with round walls creates optical illusions.

It is very difficult to equip such an aquarium, and fish need a filter and compressor, it is desirable to also have a heater. Nitrates obtained during the life of the inhabitants poison water. A lack of oxygen is deadly. The heater maintains a constant temperature of the water in the aquarium, which will extend the life of the pet and improve its quality.


It would seem that feeding is a source of life and health, but not always. Feed the fish in small portions 2 times a day. For feeding, you can use ready-made dry mixes for goldfish, live and / or frozen food. But it is best to alternate different feeds.

Remember the important rule - it is better to underfeed the fish than to overfeed.

Due to improper feeding, the fish appears constipated, the stomach swells, the goldfish swims sideways, its movements become quite chaotic. Changeling - a symptom that is unnecessary to describe. The fish swims belly to the top, does not move. And if you try to make a movement, then it turns out awkwardly. This situation is also a consequence of overfeeding. Due to the swollen stomach, the swim bladder shifts and loses shape.

But do not forget that too much feed spoils the quality of the water in the aquarium, is fraught with infection, rapid growth of brown algae and other aqua troubles!

Waste products

Ammonia is a poison that living organisms release during digestion. Ammonia poisoning is a common occurrence. If the filter system is faulty in the aquarium. Or the water rarely changes, the bottom carelessly siphons - all this leads to complex poisoning. Symptoms are visible to the naked eye - red spots on the body of fish, red gills, red veins. If the aquarium is not closed, gold jump out of the poisoned tank. The destruction of the gills is also caused by ammonia, but it is noticeable only in the later stages.

The treatment of poisoning is its prevention. Goldfish produce a lot of waste, while the larger the individual, the more it pollutes its home. Install a reliable filter that matches the volume of your aquas. Change the water weekly to ¼ and be sure to clean the bottom with a siphon. If diseased individuals are found, water is replaced daily until symptoms disappear.

Gas embolism

Gas embolism literally translates from Latin as a blockage. This is exactly what the patient looks like - the body of the fish is covered with air bubbles. As a result, the pet's behavior becomes strange. Fish quickly and randomly rushes around the aquarium, then freezes. In extreme situations, the body of aquatic inhabitants swells. Unfortunately, we cannot apply measures for treatment, we can only wait until the aquatic environment returns to normal and the gold becomes easier.

However, to prevent such a situation is easy. Never pour unwanted water into a jar. If you use air conditioners to improve the quality of water, or osmosis, then mix the water before pouring into the aquarium to get rid of excess bubbles and protect the health of pets.


The strange, unusual behavior of goldfish can also speak of the state opposite to the previous ailment - asphyxiation. Asphyxia - literally means suffocation. The fish has nothing to breathe, she is long rises to the water's edge and grabs air, the movements become either abrupt or barely visible. Pets lose their appetite, and their gills are ajar.

What to do with asphyxia in fish? It is possible to reconsider the population of the aquarium. Often fish do not have enough air when overpopulated. If not, pay attention to the compressor, perhaps it should be replaced. Plant live plants in the aquarium, they will help the little fish feel better. As an emergency measure, clean the bottom of the aquarium and replace part of the water, but not more than 1/3 at a time.


Semolina or ichthyophthyroidism is another dangerous, contagious disease. Therefore, before proceeding with the treatment, the fish in which white dots on the body need to be set off from the rest and preventive procedures should be carried out in a common aquarium. It was written about them in the previous paragraph - dropsy.

Ichthyophthyroidism is a fungal infection. White dots, resembling semolina, cover the body of the fish, tail and fins. Over time, the infection eats fish tissue. This disease is caused by poor water quality, or by spores. Perhaps you did not wash the new equipment, plant or decor item before placing it in the aquarium, or maybe the new pet has not quarantined and infected the jar. With ichthyophthyroidism, treatment of an infected individual can be done using Bicilin, Formalin or salt. We talked about how to treat goldfish with salt at the point - injuries. Use Bicilin and Formalin in accordance with the instructions for use. In addition to treating a patient with decoy, the same aquarium should be treated with the same drugs for prophylactic purposes.

Smallpox virus

Neoplasms on the body of a goldfish in the form of a growth on the head, trunk, fins having a whitish color, and sometimes lilac, indicate smallpox. Another symptom that should be considered in conjunction with the previous one is bruising on the fins and tail (if there are no growths, it can be a symptom of another disease).

If your goldfish is pale, lost color you need urgently strengthen her immunity. Unfortunately, there is no other way to help fish with smallpox, how to strengthen its strength for independent struggle with the disease. To increase the immunity of a goldfish, 1/3 of the water in the aquarium should be changed daily, aeration should be increased, and a greater amount of live food and fresh vegetables should be added to the diet, which must be rinsed with boiling water before use.
Be attentive to the size of portions of live food, because its surplus has an extremely negative effect on water quality.


Red spots, black spots, bruises on the tail, red gills, black dots, ulcers, feces with blood, bulging eyes - all this in a compartment or individually signs of the most dangerous disease - furunculosis. Gold looks like a blind. The fish turned white. Swims on its side. If one individual is sick, it must be urgently put off. If several, then treatment can be carried out in a common aquarium. Which must be processed and cleaned in any case. The drugs will be Phyosept or Antibak. Use them in accordance with the instructions for use.


Associated with a high ammonia content. This is a product of the vital activity of fish, even in small quantities it becomes toxic to individuals.

Causes. With an increase in the amount of ammonia in water, an alkaline reaction occurs. The cause of acididemia is a rare replacement of water with fresh water, also overpopulation of the basin, and the accumulation of decaying organic matter.

Symptoms The color of the fish darkens, they stay on the surface of the water due to a lack of oxygen, sometimes they strive to jump out of the pond / pool or reservoir. Gills may be damaged.

Treatment. Treatment begins with a partial replacement / renewal of water, which will help save the fish. If there are a lot of individuals in the reservoir, it is recommended to install an additional filter, turn on the compressor. For prevention, it is advisable to measure the amount of food, fish and the size of the pool. Immediately remove from the container the remains of food, dead fish.

Alkaline disease (alkalosis)

Alkalosis is associated with an increase in the level of acidity of the medium. The consequence is the dullness of the skin of the fish, the release of mucus from the gills.

Causes. In a tank with soft, acidic water, densely planted with plants and in intense sunlight there is a risk of a sharp jump in acidity. A long stay of fish in such an environment can cause alkalosis.

Symptoms Residents of the reservoir become quicker breathing, they begin to spread their fins and rush about capacity. Noticeable coordination disorders, convulsions. Fish make attempts to jump out of the water.

Treatment. Immediately after the establishment of the disease, the fish are transplanted into the pool with a hydrogen index of 7.5-8. In a pool with a high level of acidity, the value is gradually brought to an optimum low. It will be possible to achieve the desired indicators with the help of a special pH buffer.

Fish shock

This is the physiological reaction of the body to sudden shocks of various types. Usually, a shock is manifested when too one or several environmental factors change (in particular, the temperature or chemical composition of the water).

Causes. Usually a shock is observed in fish that have just been launched into a pool / pond, but often such an ailment is manifested due to a partial change / change of water, if attention is not paid to this parameter.

Symptoms The color intensity decreases, fish hide among plants or other objects, in individuals accelerated or slowed breathing, they periodically abruptly move to another place.

Treatment. If the shock begins rapidly and clearly, the cause is initially established, and then treatment is started. If all the inhabitants of the reservoir are affected, change the conditions in it. If recently launched fish were shocked, they are transferred to more suitable conditions (water with the usual parameters).

Gas bubble disease (gas embolism)

During a gas embolism, the fish begins to behave shyly: lose coordination in case of eye damage, swim on its side.This indicates the need for urgent action.

Causes. Not sludge water, which filled the pool or pond. It contains many air bubbles leading to gas embolism. Another reason is immoderate pool aeration. From a large number of plants with too intense lighting, excessive saturation of the “home” with oxygen can occur.

Symptoms It appears in the form of bubbles on the body and eyes of the fish. Bubbles can also appear on the internal organs of the fish, which can be fatal in 60-80% of cases. Sluggish fish, refuses to feed. The fins begin to twitch convulsively, the gills move less frequently, the eyes become cloudy, and the coordination of movements is disturbed.

Treatment. To eliminate the excess of gases dissolved in water will help the method of settling the supplied water in the intermediate pools with minimal movement of water. After 18-24 hours, the gas regime is fully normalized.

Catarrhal disease

Long-term keeping of fish at an unacceptable temperature of the water leads to a cold, due to which the activity of individuals decreases, they swim on the surface.

Causes. It arises in connection with the content of fish in colder water than is permissible. Usually warm-water fish are kept in water at a temperature of 22-27 degrees, cold-water fish are 18-22 degrees.

Symptoms Cold individuals become dark, earthy, their gill petals swell and darken, growth slows down, degenerative changes are observed in the internal organs. Because of this, fish produce immature caviar and milk. The fry die.

Treatment. Normal conditions are created for infected individuals by raising the temperature to an optimal level. Water is pumped with oxygen, disinfectant drugs are used.


In obesity, fish may have difficulty moving. Obesity is accompanied by invisible internal problems: digestive tract disorder and functional infertility resulting from the formation of fatty deposits around the gonads, the liver is flooded with fat.

Causes. High nutritional food in which the fat content for plant individuals is more than 3%, and for carnivores 5%. Obesity also occurs when overfeeding, improper or monotonous feeding of fish, including dry food. A common cause is a densely populated pond or pool where fish cannot swim freely and lose calories.

Symptoms Large girth of the body in the abdomen, as well as the area between the head and abdominal region.

Treatment. A medical diet and a strict feeding regimen will help to cope with the problem. It will not hurt the fish to reduce food intake to an absolute minimum until her body again becomes as nature intended.

Sexual cyst

Sexual cysts occur when fish are divided by sex. It proceeds chronically, due to which it is detected late, when milk or caviar has already succumbed to changes.

Causes. Long-term maintenance of females and males separately, excessive feeding with dry feed.

Symptoms The belly is greatly increased, because it contains a lot of liquid or porridge-like contents. This causes severe pressure on the genitals of the fish, which leads to impaired functions and metabolic processes in the body as a whole. The neglected form is fraught with the death of the fish - the cyst ruptures.

Treatment. It is treated only at the initial stage. To do this, put the fish upside down in a cotton moistened with water and gently stroke it from the pectoral fins to the caudal fin - this is how the contents of the tumor are squeezed out. Such actions help to achieve a positive result.

GI inflammation

This is a common problem observed in fish. Dry food is poorly absorbed and causes inflammation of the mucous membrane of the gastrointestinal tract of fish.

Causes. Fish caught in the wastewater of a pond are fed into a pool or artificial pond when fed with dry daphnia, hamarus, bloodworms. Also, fish suffer from inflammation of the digestive tract due to the consumption of poor-quality feed.

Symptoms Fish eat well, but seem lethargic. Their skin darkens, the belly slightly increases. Redness of the anus, a filiform form of feces with bloody mucus, also testify to intestinal inflammation.

Treatment. Inflammation is treated simply: fish are transferred to a varied, full-fledged feeding with live hydrobiopts. It is undesirable to get live feed in water bodies, where sewage from domestic and industrial enterprises comes.


Invasive disease of freshwater fish. In pond fish farming, young fish weakened by wintering are affected. But often chylodonellosis appears in warm-water ponds.

Causes. Chylodonellosis, externally manifested in the formation of coarse-grained formations of a gray-blue hue from mucus, at the initial stage of the development of the disease is noticeable only from a certain angle of view, caused by three types of ciliates from the genus Chilodonella - Ch. hexasticha, Ch. cyprini (piscicola) and Ch. uncinata.

Symptoms Infected individuals begin to rub against stones and plants, press their fins. Appetite decreases occasionally. On examination, when the fish is located upside down, a bluish-matte coating is visible along the lateral line. Sometimes the skin behind flaps. Often, the infection of the gills provokes the mass death of fish.

Treatment. Before starting treatment, the fish are kept at a temperature of 30-32 degrees, which helps to restore strength. If symptoms are noticed at a time when the fish do not refuse to feed, the recommendation is not necessary. It will be effective to treat simultaneously with the use of a reduced dosage of Sera Mycopur. Chylodonellosis is also treated with antibiotics.


An invasive disease caused by monogenetic flukes. About 150 species of monogenes are known.

Causes. The causative agent of dactylogyrosis is a fluke from the genus Dactylogyrus, which has an elongated body.

Symptoms A fish infected with a parasite loses its appetite, stays at the surface, eagerly swallowing air, rubs against objects. A thick layer of mucus appears on the gills of an animal, resembling a mosaic. Gill petals grow together.

Treatment. The infected individuals are transferred to the quarantine pool, where a 0.2% ammonia solution is added previously at the rate of 2 ml per 1 liter of water. For the treatment of fry in growth and fry ponds, chlorophos solutions are used (the drug is added at the rate of 0.6-1 g per cubic meter of water). In a common reservoir, larvae without fish will die within 24 hours. When buying new individuals, they are quarantined. Disinfect the container with a solution of baking soda.


An ailment during which fish suffer from loss of appetite, their breathing becomes frequent, a complete slowdown of the reaction occurs. Fish die, turning on their side.

Causes. Trichodinosis occurs due to ciliary infusoria, it has a round body shape and a reddish tint. The parasite lives on the skin and gills. It enters an artificial pond from a natural reservoir, where fish are found, with soil and plants.

Symptoms The body of infected individuals is covered with a dull mucus, which prevents the fish from breathing normally. In the initial period, the fish worry, constantly float to the surface of the water to swallow air. The gills also have a thick layer of mucus.

Treatment. Carry out aeration by adding methylene blue. In an empty pond without fish, ciliates die in 2-3 days. As therapeutic preparations, organic dyes, sea water, solutions of active chlorine and sodium chloride are used. Processing is carried out after 24-48 hours. Only 3-4 treatments. For prevention, it is imperative to observe hygiene measures, move new individuals to quarantine before moving to other fish.


Infection with hydrodactylosis can lead to the death of fish in the common pool within a week. In fish with such a disease, appetite disappears, and a plaque appears on the skin and gills.

Causes. It is caused by monogenetic flukes by gyrodactylus from the family of the class Monogenea.

Fluke fingerprints under multiple magnification of a microscope

Symptoms The affected fish sway and stay on the surface of the water, their fins are tightly compressed. As the disease progresses, the fish begin to rub against objects. Separate blue or gray patches appear on the surface of the body, the eyes become cloudy, and a raid forms on the gills.

Treatment. For treatment, salt baths from a 5% sodium chloride solution are used with an exposure of 5 minutes. In winter, it is permissible to add purple “K” to the ponds at the rate of 0.2 g per cubic meter. m. For preventive purposes, observe hygiene rules, regularly disinfect the tank. Before planting fish to spawn during the day, it is necessary to treat the pool with a solution of sodium chloride.


The causative agent is sporozoans - they are colonized on tissues, internal organs, gills. When ingested, they mate, forming white nodes that appear on the body of the fish.

Causes. The parasite can get into the pond along with sick fish, when the disease is only at the initial stage. Fish of the cyprinid family are particularly susceptible to glugeosis.

Symptoms It is accompanied by bloody spots that turn into ulcers, unilateral or bilateral buccal eye, cone-shaped protrusions on the body of the fish, swimming on its side.

Treatment. Today there is no way to get rid of the problem. If glugeosis is established, it is advisable to get rid of all the plants and fish contained in the pond.


During lerneosis, sick fish are depleted, refuse to feed, lose their mobility, accumulate in the water duct and die.

Causes. This is an invasive disease of freshwater fish caused by the copepod Lernaea cyprinacea from this family. Lernaeidae, parasitic on the body of individuals.

Symptoms Parasites invade the skin and reach muscle tissue, penetrating deep into it, located on the entire surface of the body. In places where crustaceans are introduced into tissues, an inflammatory process occurs: swelling, hyperemia, leading to the formation of ulcers. Scales not only deform and rise, but also fall out.

Lerna copepods attached to fish

Treatment. Lerneosis is difficult to treat. Use various drugs and various treatment methods. For sick fish, it is recommended to prepare a quarantine pool with optimal conditions and add sodium chloride solution at the rate of about 20 g of salt per 10 l of water. Fishes are kept in such a solution until complete recovery and wound healing.

Octomitosis (hexamitosis)

This is a parasitic disease that adversely affects the gallbladder and intestines. Outwardly, it is easily determined by the presence of holes, ulcers and furrows. For this reason, hexamitosis is also called a “hole” disease.

Causes. Failure to comply with basic conditions for caring for the inhabitants of the reservoir or pond. These include a lack of minerals or vitamin deficiency (which leads to a decrease in immunity), rare or excessive feeding, use of poor-quality or spoiled food.

Symptoms The fish lose their appetite, they become picky during meals, white mucous secretions appear. The abdomen also swells, the fins collapse and fall off, deep erosion appears on the sides of the body of the fish, the anus increases.

Treatment. Initially, infected fish are moved to the quarantine pool, due to which it will be possible to prevent the development of the disease in a common vessel. After that, in a separate container (quarantine), the water temperature is increased to 34-35 degrees - this contributes to the detrimental effect on part of the parasites, leading to their death.

Ichthyophthyroidism ("semolina")

All species of fish are exposed. The people call it “manna disease” due to the formation of white grains on the fins and scales of fish.

Causes. The causative agent is the ciliary infusoria. The parasite is highly adaptable.

Symptoms Fish often breathe, begin to itch on objects and hard surfaces, subsequently suffer from white plaque in the form of grains.

Treatment. As a preventive measure, quarantine is recommended - beginners should not be immediately launched into a common pond. For treatment, it is permissible to add water and raise its temperature - the parasite does not tolerate a salty environment and an increase in the temperature level of water. Also, bactericidal drugs are used to combat ichthyophthyroidism.

Mycobacteriosis (tuberculosis)

Viviparous species of fish suffer from mycobacteriosis. Their behavior changes, their appetite disappears.

Causes. Carried with food, plants or soil. With fish and shellfish. There are cases when insects that flew to drink water became the cause of mycobacteriosis. Improper conditions of detention, weakened immunity lead to the development of mycobacteriosis.

Symptoms Fish become sluggish, bulging eyes, they lose orientation, some go blind. Also, animals suffer from ulcers, tears, blindness, apathy.

Treatment. It is carried out at an early stage: for this, the use of Monocycline, Tripoflavin, copper sulfate is recommended.

Aeromonosis (rubella carp)

A bacterial infection of cyprinids, when scales flake over the entire surface of a fish’s body, begins to fall out. Treatment can lead to recovery or death of the individual.

Causes. Aeromonosis is brought into artificial ponds and pools from natural reservoirs, when the fish, non-quarantined, are re-settled with soil, vegetation, water. The infection spreads due to poorly sanitized equipment, tools.

Symptoms In the acute course of the disease, fish die en masse. Serous-hemorrhagic inflammation of the skin, hydremia of tissues of organs, muscles appear on the belly, fins, side walls of the trunk. In the chronic course, open and scarring ulcers form, accompanied by anemia of the liver and swelling of the kidneys.

Treatment. Aeromonosis can be treated only at the initial stage. Fish with abdominal dropsy and raised scales are destroyed. Outwardly healthy fish must be processed by immersing in a separate vessel using the main violet K (Chlorohydrite, a synthetic dye), Bicillin-5 or soluble white streptocide per 100 l of water of 15 g are poured into a common tank.

Bacterial Fin Rot

With this disease, the fin disappears in the fish. Ulcers appear at its base, the spinal column is exposed, this leads to death.

Causes. It occurs in connection with an infection that destroys the fins of fish. The causative agent is the wand. The development of fin rot provokes non-compliance with the rules of care, a rare change or purification of water in a pond or pool.

Symptoms. At the beginning of the disease, at the edges of the fins, a slight turbidity of the color of a bluish-white hue appears. The fins along the edges are disheveled, the ends of their rays gradually disappear.

Treatment. They are fighting radically. Initially improve fish conditions. With a severe lesion of the fins, medications can not be dispensed with. Regularly disinfect the pool.

Lepidortosis (infectious erosion of scales)

Lepidortosis is slow. After it, the fish die, but with timely treatment it will be possible to achieve a successful conclusion.

Causes. The causative agents are bacteria that enter the artificial pond from a reservoir where there is fish with food.

Symptoms At the initial stage, affected individuals suffer from the fact that in some areas the scales are ruffled. Gradually, the phenomenon spreads to the whole body. Soon, the scales begin to fall out, which leads to death.

Treatment. Treatment of infected fish is permissible at the initial stage. It is recommended to conduct therapeutic baths with the drug Biomycin or Bicillin-5. When treating in a separate vessel, the use of the main violet K.If therapy fails, fish are killed, and the pool and other equipment are disinfected.

Pseudomoniasis (peptic ulcer)

Symptoms are developing rapidly. In most cases, peptic ulcer leads to the death of fish.

Causes. Caused by bacteria entering the pool with food or from sick relatives. The sources of pathogenic pathogens include poorly defended water. The bacterium may be in the container with human hands.

Symptoms It is accompanied by the appearance of dark spots on the skin of the fish, gradually they turn into ulcers. Also, the fish’s belly becomes larger, their eyes bulge, their appetite decreases, their scales ruffle. Infection enters the body.

Treatment. It is required to start treatment in a timely manner. For control, streptocide is used, having dissolved one tablet in 10 l of water. They also treat fish with potassium permanganate by dissolving it directly in the pool - 5 g of solution falls per 10 liters of water. Fish should swim in such a solution for about 20 minutes, then collect clean water.

White-skinned (exc. ​​Pseudomonas dermoalba)

Infectious, serious disease that negatively affects the body of fish, therefore it requires good treatment immediately after the first symptoms are detected.

Causes. The defeat of the fish organism by a pathogenic bacterium that can enter the pond from a natural reservoir along with diseased fish, soil and plants.

Symptoms Whitening of the skin in the dorsal fin and tail region is observed. The fish keeps closer to the surface, often exposing the fin out. The color turns white. Lack of treatment may be accompanied by damage to the central nervous system and organs responsible for coordination of movement. This is fatal.

Treatment. It will be possible to prevent compliance with basic hygiene rules. Affected fish are moved to another container for quarantine. Dissolve 150-200 mg of Levomycetin in 1 liter of water, the composition is poured into a reservoir with sick fish. In such conditions, they contain at least 5 days.


This is a fungus that affects the gill apparatus of fish. The causative agent of branchiomycosis is Branchiomyces demigrans and Branchiomyces sanguinis.

Causes. Mushrooms settle on gill petals. From the disease can affect all species of fish contained in inappropriate conditions. The disease develops due to the high temperature of water, organic compounds of dead plants. There is a rapid development of the disease.

Symptoms Ill fish do not have enough oxygen, pinpoint hemorrhages are visible on the gill leaves, and the gill covers are deformed. Fish refuse to feed, always swim at the surface of the water, scooping up air with their mouths. Bright red and pale spots become visible on the gills.

Treatment. When the first signs appear, all fish are transferred to the quarantine pool and treated with malachite green oxalate, and the viewing tank is cleaned and disinfected. Cleanliness and hygiene in the pool will help to avoid branchiomycosis.


Dangerous fungal disease of pond and aquarium fish. Caused by an allegedly imperfect Phycomycetes fungus.

Causes. The causative agent is Ichtyophonus hoferi, having a round or ovoid shape. Around the fungus is the formation of a capsule secreted by the affected organ. Hyphae are also observed in the form of blunt outgrowths, stained into an independent rounded body.

Symptoms The causative agent is carried hematogenously in various organs and tissues, where inflammation first develops, then the affected areas are encapsulated. In case of dysfunction, the fish stops responding to stimuli, its movement becomes erratic and lethargic. She keeps off the coast. In case of damage to the liver and kidneys, there is observed eyebrows, erosion of scales, ascites. The localization of the pathogen in the subcutaneous tissue, muscles and eyes leads to bumpy swelling and ulcers, black spots on the skin.

Treatment. Not developed. But they must control the process of transporting fish. It is imperative to feed the fish with sea relatives only after heat treatment. It is also desirable to timely disinfect ponds with quicklime or bleach for prevention purposes.

Saprolegniosis ("cotton disease")

Mycotic disease of most fish species caused by opportunistic aquatic fungi from the class Oomycetes. More often this is a secondary disease, first injured parts of the body or damaged eggs are affected, then the disease passes to healthy areas and eggs.

Causes. The causative agents of the disease are representatives of the genera Achlya and Saprolegnia. The mycelium of these fungi is formed by hyphae with a limited number of transverse septa.

Symptoms The most characteristic sign of the disease is cotton-like, fluffy white growths on the caudal and dorsal fins, head, olfactory fossae, eyes and gills. Before the death of the fish, a loss of balance was noticed.

Treatment. In summer and autumn, for prevention, it is recommended to treat the fish twice with the main purple K at the rate of 1 g per cubic meter. m of water for half an hour. Also suitable are 0.1% salt baths for 30 minutes. To combat the disease, disinfect the water that enters the incubation workshops with ultraviolet rays.


With this ailment, the eyes swell greatly, often completely fall out. This symptom occurs with an infectious infection, for example, with ichthyosporidosis, mycobacteriosis, etc. The method of treatment directly depends on this.

Causes. Glaucoma can occur due to infection of fish with viruses, bacteria or fungi. Along with this, failures of a physiological nature, trematodes, eye nematodes (worms), and a lack of vitamins (vitamin deficiency) are referred to provocateurs.

Symptoms Blurring of the whole eye, the appearance of a whitish film, the eye moving away from the body. Running cases lead to the loss of one or both eyes.

Treatment. If hepatitis occurs due to a bacterial infection, it is initially treated using antibiotics and adding them to food. In the event of a problem due to inappropriate living conditions, begin by eliminating them: regularly clean the water, feed the fish in a balanced manner.


Dropsy is accompanied by severe bloating, puffed scales. The fish becomes lethargic, breathing heavily.

Causes. The reasons for an increase in the abdomen include mycobacteriosis, aeromonosis, nocardiosis. In addition to bacteria, the cause of bloating can be a virus (spring viremia). With a cyst of the gonads, an increase in the abdomen of females is also observed.

Symptoms Swollen belly, clear skin due to a strong increase in the abdomen, curvature of the spine.

Treatment. The fish is immediately precipitated, observed and inspected. Fish are treated depending on the causes of the enlargement of the abdomen, but most often the fish die if bloating is caused by a bacterial infection.

If you learn to recognize the causes and symptoms of diseases, you can prevent them or cope with ailments using effective methods. Compliance with simple hygiene rules, frequent water changes, and feeding fish with high-quality food will reduce the risk of infection of fish that are bred in natural or artificial conditions.

1 comment “Aquarium fish is sick”

In addition to caring for the aquarium, it is of great importance than feeding the fish. All the same, you need to feed only high-quality dry food, I was convinced. Once I bought an ice-cream bloodworm, I had to treat the whole aquarium with fish, and the seller assured me that it was fresh and of high quality ... It also happens that the fish are malnourished, their immunity weakens, and the weak ones don’t get food at all and die. Therefore, it is necessary to pour the feed a little bit in small portions three to four times, monitoring whether everyone eats up and so that the feed does not fall to the bottom. Weak people should not be separated separately, they won’t eat, it’s stress for them, so you need to make sure that they have time to eat at least a few crumbs of cereal. When they grow up noticeably, then you can no longer worry about them.