Very often pathogenic simple organisms from rivers and ponds enter the aquarium, which can cause enormous harm to the population of the indoor pond. Kostiosis is a serious disease of juvenile fish caused by parasitic flagellates. It leads to the mass death of fry and, if untreated, can completely destroy the population of growing aquariums. The causative agent of the disease is the flagellum Costia (Ichthyobodo) necatrix. These are unicellular parasites that parasitize on the skin, gills and fins of fish. They attach to the owner with their modified end of the body - rostrum. Parasitizing on the skin, ichthyodobo destroys it, causing an abundant separation of mucus. The parasite feeds on this mucus, as well as microorganisms that multiply in it in large quantities. The grown parasite leaves the host, sinks to the bottom and becomes covered by a cyst. At this stage, the flagellum divides, forming many daughter cells. Young parasites leave the cyst and rush in search of a new host.
Symptoms of the disease
Kostiosis leads to the death of only juvenile fish. Adult fish do not suffer from this disease, although they are often carriers of the parasite. Affected fry are covered in the places of flagellates with a thick layer of mucus. Their fins look stuck together, their breathing is heavy, their gills are protruding. A strong increase shows that the affected gill lobes are also covered with mucus, which leads to suffocation and death. However, at first these symptoms are not very noticeable on small fry. Often an inexperienced aquarist discovers the disease only after the fry begin to die in the hundreds. This disease is also dangerous because it leads to secondary infection with fungal infections. Affected areas of the body are often covered with saprolegnia, which worsens the condition of the fish and complicates treatment. To save the fry, it is urgent to begin treatment of the disease.
For successful treatment of fish bone disease, it is necessary to put them in a separate vessel and apply therapeutic baths with antiparasitic drugs. Good results are obtained from sodium chloride, potassium permanganate and copper sulfate. One tablespoon of salt is dissolved in 10 liters of water. In this solution, the fish contain up to 20 minutes, after which they are transplanted into clean water. Treatment of diseased fish is repeated twice a day for a week. A weak solution of potassium permanganate, which has a pale pink color, is also used. It contains fish twice a day for 30 minutes. It takes about 5 days to fully recover. To prepare a solution of copper sulfate, take 1 g of the drug per 10 liters of water. To kill parasites, fish are placed in the solution for 30 minutes twice a day. Parasites completely die in 4 days. In the treatment, methylene blue is used, which prevents the development of pathogenic fungi on the skin of fish. The aquarium where the disease was discovered does not need to be processed. It is enough to raise the water temperature to 34 ° C for two days. During this time, all protozoa die.