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Diseases of aquarium fish with descriptions and photos

Hello, dear readers of my blog, I hope you enjoyed my last post about going to the Kiev exhibition of fish? Who liked, great, well, and not very, I apologize, because you will not please everyone. I want to talk to you today about aquarium fish diseases.

The article will be large and I plan to divide this topic into several posts, I don’t know how many parts exactly, 2 or 3, I haven’t decided yet.


This infection occurs in aquarium fish because of the small blood-sucking crustaceans (arguments), which actively nibble almost all types of fish, very often the younger generation in spawning breeds suffer from this nastiness. The crayfish is about 4-7 millimeters long, it has a rather wide cephalothorax, at the bottom of which is located the proboscis, eyes, suckers, stylet and four pairs of legs for swimming.

This parasite begins to multiply actively when water reaches a temperature of 12 degrees Celsius. The female lays eggs on the ground, stones or plants. Basically, an average of 200-300 eggs are produced in the clutch.

Over time, the young hatch from the eggs, which begins to swim in your aquarium and attack fish. Somewhere around 16-18 days he needs to become sexually mature. As soon as the youth of the crustaceans reaches sexual maturity, the cycle repeats again.

If the larva could not cleave to the fish for 3 days, then it dies. The eggs of this crustacean will die quickly if they start to dry quickly.

How can this stuff get into your tank? Very simple!

The larvae of arguments can be on the ground, in water, in live food taken from natural water bodies and on plants. When a parasite bites a fish, poison is injected into its body, which will be fatal for young people.

If the crayfish is bitten by an adult fish, then an ulcer will appear at the bite site. In the place where the parasite is attached to the fish, the skin becomes inflamed, a lot of mucus appears on it and gradually this area of ​​skin begins to die off.

How to get rid of this parasite? It is necessary to catch all the affected fish with crustaceans, put them on a wet tampon, pick up thin tweezers and gently remove them from the fish. You can also use various medical lotions made from potassium permanganate or trypaflavin.

As a preventive measure, you need to carefully sort live food, if you find parasites, they need to be destroyed, inspect the purchased fish carefully for the presence of parasites.


Glugeosis is the same invasive disease of aquarium fish (mainly tooth teeth), which is caused by small spores, affecting various internal organs of the fish (intestines, liver, kidneys, corneas of eyes, gills, in muscle and connective tissue). How can such filth get into your underwater garden?

The pathogen can get from natural reservoirs, other aquariums in which there are fish, water, soil, plants or live food. A fish becomes infected if it swallows the spores of this parasite.

The pronounced signs of glucose are the following: the fish constantly swims on its side or it becomes a bug-eye from one or two sides. Moreover, the body of the fish appear round white nodules, something like a tumor.

When a parasite enters the body of a fish, as a result of its activity, the functions of internal organs in aquarium fish very often break down, which can later lead to death. Unfortunately, no one knows the cure for this parasite.

The only thing possible is to fight it. Destroy all unwanted vegetation in the aquarium, disinfect the aquarium soil by calcining or boiling, completely disinfect your aquarium.

As a preventive measure, newly purchased fish are placed in a quarantine tank for a month, and only after that they can be allowed into the general aquarium.


This invasive disease of aquarium fish is caused by small worms, the size of which in rare cases reaches 1 millimeter. These worms (dactyloguiruses) actively attack the gills of fish. When the parasite has attached itself to the fish gills, over time, it begins to produce offspring, which then grows up and attaches to the gills of the other fish.

Worms develop most intensively at a water temperature of 22-28 degrees Celsius. Any fish can get sick, be it small or big.

How can your aquarium get infected with such filth? Perhaps the only 100% infection of an aquarium is to get an infected fish in it. When an aquarium fish is struck by this parasite, its behavior immediately begins to change, the fish begin to snap up air at the surface, they hardly react at all to the person.

Over time, the gills become anemic and become covered with mucus. In the place where the parasite is attached to the fish, the blood vessels and epithelial tissue begin to break down.

The fish have problems with gas exchange, the affected fish begin to actively attack various fungal and bacterial diseases. It is necessary to treat the inhabitants of your aquarium using the same methods as with gyrodactyllosis.


This disease aquarium fish develops due to moldy fungi that are actively developing on the skin of fish. Absolutely all species and age categories of fish can suffer. The main cause of this disease is the poor conditions in which your aquarium fish are kept.

Mass options: not the salt composition of water, poor aeration of the aquarium, prolonged fasting and many other things, including infections and parasites.

Over time, thin white filaments of fungi appear on the fins, skin, and gills, which fry perpendicularly from the surface of the fish. After a couple of days on the place where the threads were, a white bloom like cotton wool will appear. The longer this filth is on the fish, the more pernicious the consequences.

Hyphae of fungi begin to invade the tissues (gills or muscles), which are subsequently destroyed. Then this muck is switched to the internal organs, which will inevitably lead to the death of the fish. To treat this attack in the general aquarium is problematic, but possible.

For this, a solution of white streptocide is used (100-200 milligrams per 100 liters of water), or the use of bicillin-5 (500,000 units per 100 liters of water). If you decide to treat the fish with white streptocide, then this should be repeated every 7 days for a month. If you decide to treat Bicillin-5, then this treatment will last about a week.

Before using bicillin, reduce the brightness of the lighting in the aquarium, as it will quickly decompose in bright light.


This specific disease of aquarium fish is caused by infusoria, which affects the skin of the fish. The ciliate grows outside the body of the fish, after it breaks the epithelium and descends to the bottom of the aquarium.

As a result of reproduction, daughter cells are formed that can swim in aquarium water for up to 3 days.

When the parasite gets on the skin of a fish, it attaches to it, and then it falls under the epithelium, where it develops successfully. When this reptile reaches a mature state, the cycle will be repeated. I want to immediately say that the parasites that live under the skin of the fish can be clearly seen even with the naked eye, since they have the appearance of white tubercles that look like semolina.

Every fish can get ichthyphosis, you can bring a parasite with food, water, soil, plants, sick fish or clams.

This parasitic disease does not have any time frame of activity, it can be brought into the aquarium at any time of the year. Sick fish will be restless, very often try to rub on the ground or the plants constantly stick up near your internal filter turned on for aeration.

If the parasite is in the body of the fish for a long time, the epithelium of the fish will literally peel off, the fins will begin to split over time, the cornea of ​​the fish’s eye will suffer, which will eventually lead to blindness, even gill capillaries may rupture, leading to bleeding and poor gas exchange.

It should also be said that the enzymes of the parasite, which are very toxic, have a very detrimental effect on the body of the fish. The disease lasts for about two weeks, and ultimately your fish may simply die.

If a fish has had this parasite, it will have a relative immunity.

How to cure your pets from this disease? All fish should be transplanted from an infected aquarium into an aquarium in which there is neither vegetation or soil.

Fill up with Ichthyophthyricide (1 ml for every 20 liters of water) or a solution of biomycin (50,000 units per 100 liters of water), quinine sulfuric acid, or hydrochloric acid (0.5 gram) and tryplavlavine about 20 milligrams. Since quinine is difficult to dissolve in water, the addition of trypaflavin should be postponed for 3-4 hours. Then gradually increase the temperature in the aquarium to 32 degrees Celsius, and do not forget to observe the behavior of the fish.

Turn on strong aeration. After three days, change a third of the water and add fresh, to which you have previously poured biomitsin in a volume of 50,000 units, and 5 milligrams of trypaflavin.

Full treatment basically proceeds within 2 weeks, by the 15th day all white bumps should disappear. Feed the fish either as a pipe worker or as a bloodworm.


This invasive disease of aquarium fish is caused by tape worms (cloves) that inhabit the intestines of fish. The worm can grow up to 25 mm in length, the parasite is white in color, and the head has the shape of a carnation flower, from which it received this name.

Already mature helminths in fish in the intestines begin to actively lay eggs, which then come out with excrement and settle on the soil of the aquarium for 30-40 days. Then, eggs produce embryos that are eaten by a pipe maker, within which the larvae go through the next stage of their development, the procercoid.

Fish pick up this parasite when they eat a pipe maker infected with this worm. Further, this parasite enters the intestines of the fish and develops there within 2 months, not more, and then the cycle repeats again. Here are the types of fish that are most susceptible to infection: mollies, guppies, swordtails, gambusia, barbs, goldfish (telescopes, veils and comets).

Infected fish become very depleted over time, and their belly swells up. When the fish were infected with helminths, they found that their intestines were full of pinpoint hemorrhages, the intestines were almost completely blocked by helminths.

Alas, there is no treatment for this reptile yet, just as a measure to prevent the disease, control the condition of the pipe worker you feed your fish with.


This disease is caused by parasites of flagellates, which affect the gills and skin of the fish. When the parasite attaches to the fish, it switches immediately to the gills, and then, begins to eat the contents of the gill cells. The parasite is most active at a water temperature of 25-28 degrees, at which it begins to multiply vigorously, dividing into two.

Absolutely all types of aquarium fish, regardless of age, can get bone disease. Young animals are subject to the disease significantly stronger than other age categories.

Your fish can catch the parasite through water, soil, live food, new fish and aquatic plants. If you see that your fish are trying to scratch themselves either on something or they are restless, then you can immediately say that they have bone disease. Sometimes, if you observe, you may notice signs of suffocation with normal levels of oxygen in the water.

Over time, the fish will no longer eat, slime will appear on the gills. A little later, a gray patina forms on the body.

How to cure your fish from this scourge? Formalin baths are mainly used, in which 2 ml of 40% formaldehyde solution per ten liters of water is added; solution of free chlorine – 1 ml per liter of water. Treat your fish for kostoza you have 5-7 days.

Soil, plants, water in the aquarium can not be changed. In order to prevent, raise the temperature of the water in the aquarium to 34 degrees and keep this temperature for a couple of days.

Here is the first part of the review of diseases of aquarium fish is over, I also advise you to read the post how to care for aquarium fish on my blog, it will be very useful to you. And if you still do not know how to care for aquarium plants, then I can help you with this.

On the blog I have an article on this topic, where I told everything in detail.

Well, how do you article? I tried, I wrote it in two runs, I spent 5 hours.

Waiting for your comments on the post and subscribe to blog updates, so as not to miss the next part of the review of diseases of aquarium fish. After a few days, I plan to finish the second part and put it on the blog so that you continue to get acquainted. Until we meet again, friends, on the pages of the blog!

P.S. Here’s another video about aquarium fish diseases, study for health!

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