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 paper considers the fishery, reproduction, age-size structure of catch and growth of asps in the upper reach of the Volga of the Kuibyshev water reservoir in 1963-2014. Asps Aspius aspius (L.) in the conditions of the Middle Volga amounted 0.1-0.4 % of all catches fish. In the Kuibyshev reservoir in the 70s of the XX century its catches were equal to 0.1-0.5 % of the total fish catch. In the 90s the reduction of catches was to 0.1-0.2 %. However, in 2007-2014 their increase to 0.7 % of the total catch of fish was fixed. Based on the analysis of the distribution of asp larvae at the early stages of ontogenesis it was established that the spawning grounds of this species are confined both to the places with rocky soil and washed roots of plants and to open floodplains with aquatic vegetation. Asp spawning occurs at water temperature 1.4-11.0 °С. Taking into account the number of yearlings in summer and autumn showed that the number of asp yearlings does not depend on the fluctuations of water level and temperature in the period of spawning. Size and weight composition of catches of asp over the study years did not change significantly. This applies to the age structure of this species. The catches contained fish at the age of 2+…8+ but mostly they had species at the age of 5-6 years. The analysis of the number of yearlings and the age structure of catches indicate that restocking of fish during different periods of existence in the Kuibyshev reservoir was relatively stable. In the reservoir in the first years of formation of its ecosystem even-aged species of asp began to grow better than it was in the river. However, the growth of this species during different periods of existence of this reservoir remained relatively stable. In the southern part of the area (Delta of the Volga and the Danube, and Cimlyanskoe reservoirs) asp has the highest rates of growth. The lowest rates of growth were observed in Kamskoe, Votkinskoe and Kuibyshev water reservoirs.
asp, fishery, reproduction, size-age structure, growth, water reservoir
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