Parasitic diseases of fish in the ponds of farms of the Lviv Regional Fishery Plant
Modern scientific publications contain a large number of materials, which highlight the main ways to increase an efficiency of fish cultivation and fish productivity of ponds. Simultaneously with the means of intensification of fish farming processes, the distribution of various infectious and invasive diseases of fish, as well as the deterioration of the epizootic situation, is noted in the fish farms. To improve the efficiency of fisheries, an important role is played by the provision of private farms epizootic well-being and prophylactic and therapeutic measures for the most common parasitic diseases of fish. It is known that invasive diseases cause significant economic losses for the Ukraine fish industry. Parasites complicate the cultivation of full-fledged fish and plant material, reduce its fattening and growth rate; fish loses in weight up to 15–20%. With considerable extensiveness and intensity of invasion a death of fish occurs. Most perceptible economic losses received fish breeding farms because they can not grow a complete fish-planting material. An article deals with the issue of parasitic diseases of carp fish, which are grown in the fish farms «Yaniv» and «Rudnyky» (PrAT «Lviv Regional Production Fishery Plant»), located in Lviv region. During the growing season of fish farming, from May to September, species and age fish composition were studied, as well as the intensity and intensity of invasions of different age groups of Cyprinus carpio, Ctenopharyngodon idella and Hypophthalmichthys were researched and analyzed. The study results showed that fish during the period of the research were invasive with the following parasites: Khawia sinensis (Cestoda), Caryophyllaeus brachycollis (Cestoda), Bothriocephalus acheilognathi (Bothriocephalus), Dyplostomum spathaceum (Trematoda). In addition, a significant part of the fish was affected by crustaceans – Lernaea cyprinacea (Arthropoda) and Argulus foliaceus (Arthropoda). It was established that an emergence of parasitic diseases in experimental farms was the result of untimely and inferior prophylactic and treatment measures of fish parasites, which had led to decrease of fish farming processes efficiency and negatively affected the product's appearance, caused a decrease in mass gain, fertility, loss of fish, and also caused significant economic losses.
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