The research objective was the definition of specific structure of parasites of herbivorous fishes in natural reservoirs and the development of methods of fight against various diseases of fish on farms, and also us- ing the material at fish farms creation. The object of the research was parasitological materials collected from fishes of a grass carp (Ctenopharyngodon idella) and a white silver carp (Hypophtalmichtys molitrix) living in the Mingachevirsky reservoir in 2016-2017. 42 fish speci- mens were investigated by the method of complete par- asitological dissection. As a result of research 6 types of ichthyoparasites were found in these fishes. From them1 species refers to infusoria, 3 species to monogeneans, 1 species to trematodes, 1 species to crustaceans. Fixing, storage and processing of collected material were carried out by standard methods. For the research fresh fallen asleep fishes were used only. All tissues and bodies were investigated by a compressor method by means of binocular magnifying glass of MBS-9 increasing × 25. The dabs on subject glasses were made of each body and were investigated under Amplival microscope at the increase ×1000. For diag- nostics of all parasitic groups the measurements were taken and by means of the device RA-4 images were received. For the assessment of level of contamination the following parameters were used: invasive intensity, invasive extensiveness and the index of abundance. In comparison with a white silver carp in a grass carp spe- cific structure of parasites was richer. In both studied fishes Diplostomum chromatophorum and Lernea cyprinacea were noted. But infection with the crusta- cean of Lernea cyprinacea in a grass carp was ob- served more expressed. In all studied fishes of white cupid metatserkaria of Diplostomum chromatophorum causing cataract in fishes met. The occurrence in a res- ervoir of pathogenic parasite of Lernea cyprinacea testi- fies to potential danger which should be considered at operation of this reservoir and creation of reservoirs of this type.
grass carp, silver carp, fish, parasite, reservoir, acclimatization
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