PARASITIC DISEASES OF FISH IN THE CONDITIONS OF FARMING PONDS OF "AQVAREST" AND "AQUACITY" LLC IN THE ODESSA REGION

Abstract

The article provides data on the spread of parasitic diseases in carp and grass carp in the farming ponds of Aqvarest LLC and Aquacity LLC of the Odesa region. Fish diseases are registered both in natural reservoirs and in fish farms, as a result of which the growth rates, reproductive capacity, marketability of fish decrease, quality indicators and biological value deteriorate; in addition, mass kills of fish may occur. The causes of diseases can be both non-contagious (adverse environmental conditions) and contagious (viruses, bacteria, parasitic diseases). Thus, constant monitoring of fish parasitofauna in pond farms of Ukraine is necessary, since the study of patterns of occurrence and spread of fish diseases, forecasting of these diseases affects the effectiveness of aquaculture breeding and preservation of fish products. The purpose of the work was to monitor parasitic diseases in carp and white amur in the farming ponds of Aqvarest LLC and Aquacity LLC of the Odesa region. During the parasitological examination of this year's and two-year-old carp and white amur in the ponds of LLC "Aqvarest" and LLC "Aquasti" of Odesa region, five diseases were diagnosed, the causative agents of which were: Gyrodastylus birmani, Dactylogyrus vastator, Khavia sinensis, Caryophyllaeus fimbriceps and Philometroides lusiana. Gyrodastylus birmani and Caryophyllaeus fimbriceps were recorded the most in the deep pond of "Aqvarest" LLC with the extent of invasion of 25.7%, in two-year-old carp and two-year-old white amur - 21.4%. In the shallow reservoir of "Aquacity" LLC, Gyrodastylus birmani (31.4%) and Caryophyllaeus fimbriceps (25.7%) were most recorded in two-year-old carp, and in two-year-old white amur Khavia sinensis (28.5%) and Caryophyllaeus fimbriceps (32.1 %). The intensity of infestation with cestodoses (caviasis and caryophyllosis), as well as nematodes (phyllometroidosis) was low, 1-2 or 3-4 specimen for fish, and clinical manifestations of the disease were not always recorded. However, the presence of these pathogens in the fauna represents a significant danger for the development of commercial fish species, namely carp and white carp.