Процесс развития воспроизводительной системы у самцов осетровых рыб в индустриальных условиях на примере стерляди волжской популяции

Abstract

The article describes special aspects of reproduction system development in male sturgeons using Volga sterlet population as an example (Acipenser ruthenus Linnaeus, 1758) within industrial enterprise of the Konakovskiy coarse fishery branch of the FSBSI Russian Federation Research Institute Of Fishery and Oceanography (VNIRO). The study results showed that gonad maturation stage I–II is completed at the age of 2 years if the total thermal constant is at least 11 thousand degree-days. Cytological sex differentiation occurs in the formed gland and begins at the age of three years if the thermal constant is more than 15 thousand degree-days. The onset of cytological differentiation can be determined by spermatogenesis waves characterised by intensive development of the male gonad III–VI maturity stages. Semelparity is typical for sturgeons, thus, the wave of spermatogenesis is seasonal, which indicates their limited participation in the spawning season at fish farms with natural water temperature. The knowledge of reproductive system development aspects in male sturgeons as illustrated by Volga sterlet population in the setting of industrial enterprise allows improving the practice of spermatogenesis process management at industrial farms ensuring the production of reproductive products of high fish-breeding quality at the time required for the enterprise. Considering the thermal constants made up by sterlet (males) spawners, it is possible to synchronise fish breeding processes (cycles) when receiving reproductive products from female sterlet and ensure repeated production of reproductive products from the same males in the settings of farms with controlled water temperature (throughout a calendar year). English version of the article is available at URL: https://panor.ru/articles/process-of-development-of-the-reproductive-system-in-male-sturgeon-in-industrial-conditions-on-the-example-of-the-sterlet-of-the-volga-population/68305.html