Abstract
The article describes the problems, which are of greatest interest for the formation of fish broodstock, such as the process of gameto- and gonadogenesis and duration of spawning cycles in broodstock reared in artificial conditions. Under the Research and Experimental Aquaculture Complex BIOS of CaspNIRKH in the formed paddlefish broodstock 63 females matured in 2020. There were studied 11 paddlefish females born in 2002 and 2003, whose roe was taken for food purposes. The following parameters were determined: age of sexual maturity, duration of the spawning interval, body weight, ratio of eggs to the fish body weight. The physiological state of paddlefish females upon obtaining roe was assessed by biochemical parameters of blood: hemoglobin concentration (Hb) and total serum protein (TSP). The parameters of the reproductive function of paddlefish females obtained in the research were lower than the parameters characteristic for paddlefish in their natural habitat, and lower than the parameters of the first acclimatizers in the Krasnodar region. Sexual maturity of the studied females came quite late - at the age of 14-15, which is 1-2 years more than in the conditions of the Krasnodar region. The spawning intervals of the studied paddlefish females turned out to be 1-2 years longer than in the natural conditions. The ratio of eggs to the female body weight was about 10%, which is 1.5 times less than that observed in the American paddlefish in the natural conditions. At the same time, the biochemical parameters of blood (hemoglobin concentration and total serum protein, which characterize the physiological state of paddlefish females) turned out to be rather high and indicated a satisfactory condition of the fish. The preliminary results obtained make it possible to recommend the fish farmers of the enterprise to improve the work with paddlefish broodstock, paying special attention to optimizing the conditions for fish rearing at the stages of gonad formation.
Highlights
The physiological state of paddlefish females upon obtaining roe was assessed by biochemical parameters of blood: hemoglobin concentration (Hb) and total serum protein (TSP)
The parameters of the reproductive function of paddlefish females obtained in the research were lower than the parameters characteristic for paddlefish in their natural habitat, and lower than the parameters of the first acclimatizers in the Krasnodar region
The ratio of eggs to the female body weight was about 10%, which is 1.5 times less than that observed in the American paddlefish in the natural conditions
Summary
ОЦЕНКА РЕПРОДУКТИВНОЙ ФУНКЦИИ САМОК ВЕСЛОНОСА (POLYODON SPATHULA), ВЫРАЩЕННЫХ В ПРУДОВЫХ УСЛОВИЯХ АСТРАХАНСКОЙ ОБЛАСТИ. По своим размерно-весовым характеристикам при вступлении в репродуктивный возраст самки и самцы веслоноса, содержащиеся в условиях 6-й рыбоводной зоны России, соответствуют показателям рыб из естественного ареала обитания [6, 7]. Однако до настоящего времени не проводились исследования репродуктивной функции акклиматизированных самок веслоноса, неоднократно созревших в РМС НЭКА «БИОС» в Астраханской области, хотя к формированию этого стада приступили еще в конце 90-х гг. Цель исследования – изучить показатели репродуктивной функции самок веслоноса, выращенных и неоднократно созревших в прудовых условиях Астраханской области. Задачи исследования: – проанализировать возраст вступления в репродуктивный период самок веслоноса в РМС НЭКА «БИОС»; – исследовать межнерестовые интервалы у самок веслоноса, неоднократно созревших в стаде; – изучить выход икры у самок веслоноса в РМС НЭКА «БИОС»; – исследовать биохимические показатели крови самок веслоноса при получении икры. Рыбоводные и биохимические показатели крови самок веслоноса поколения 2003 г. при получении икры для пищевых целей в 2020 г
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