GRNTI 34.39 Физиология человека и животных
GRNTI 62.13 Биотехнологические процессы и аппараты
GRNTI 69.01 Общие вопросы рыбного хозяйства
GRNTI 69.25 Аквакультура. Рыбоводство
GRNTI 69.31 Промышленное рыболовство
GRNTI 69.51 Технология переработки сырья водного происхождения
GRNTI 87.19 Загрязнение и охрана вод суши, морей и океанов
The hydroelectric station in Konakovo is a source of thermal pollution of Ivankovskoye Rreservoir. Its heated waters affect abundance and species composition of hydrobionts. To assess the state of bream there were conducted the studies of the fatness and composition of the end products of metabolism in their muscle tissue. The fish were measured and weighed, their sex and age were determined, and the Fulton and Clark condition factors were calculated. The amount of total water, dry matter, fat, protein, ash and nitrogen-free extractives (NFE) was determined in the muscle tissue of the fish under study. The Fulton and Clark condition factors of bream species from Ivankovskoye Reservoir are higher than those from other reservoirs. On average, fish muscles contained 80.93% of total water, 19.07% of dry matter, 1.04% fat, 15.87% protein, 1.11% ash, 1.05% NFE. According to the fat content in the muscle tissue, the species belongs to the representatives of “lean” fish. Bream species from Ivankovskoye Reservoir are superior to those from Gorky Reservoir in muscle fat, but inferior in the other metabolic characteristics studied. This may be related to less favorable conditions for fish in Ivankovskoye Reservoir in summer compared to Gorky Reservoir. The metabolic indices differed slightly in the muscles of breams of both sexes. Proteins and ash accumulated more intensively in the female muscles. In the muscle tissue of the younger bream groups there was found a higher content of macronutrients than in older bream groups. This can be explained by the habits of fish in the warmed waters.
Ivankovskoye Reservoir, bream Abramis brama L, metabolism, muscle tissue, sex, age, thermal pollution
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