Parasitic diseases of commercial fish registered in the waters of the Rostov region

Fish diseases, including ones of parasitic nature, not only reduce the efficiency of aquaculture in the Don region, but also worsen the epizootic status of the Azov-Don basin in the whole because agents are introduced into the natural ponds with water, fish and fish-eating birds maintaining natural foci of diseases. The aim of this work was to identify parasitic diseases and determine contamination degree of the main commercial fish species in the waters of the Rostov region. The material for research was fish of different age groups (from yearlings to producers), the following species: carp, silver carp, white cupid, roach, perch and others. The volume of the investigated material is more than 2200 samples of fish. Parasitological studies were carried out using the method of complete parasitological autopsy and Methodical instructions on methods of control 3.2.988-00. As a result, in both natural and artificial bodies of water discovered the pathogens of the following diseases: cavios ( Khawia sinensis ), philometroides ( Philometroides lusiana, P. Sanguinea, P. Abdominalis ), bothriocephalus ( Bothriocephalus gowkongensis ), lerneos ( Lernaea cyprinacea ), eustrongylides ( Eustrongilides excisus ), ligule ( Ligula intestinalis ), posthodiplostomum ( Posthodiplostomum cuticola ), anisakis ( Anisakis simplex ) were discovered. The most frequently recorded cases were: cavios, philometroides, bothriocephalus. Cavios infected carp, wild carp, silver carp and perch; philometroides - carp, crucian carp, roach; bothriocephalus - white cupid, bream and perch. Cavios was recorded with extensity from 16% to 75% and intensity of 1-2 parasite per fish. The extensity of philometroides ranged from 20% to 33% and intensity of 3 parasites per fish. Bothriocephalus was detected with an extensity of 15-20% and intensity of 1-2 of parasite per fish.