Issues:
Sections:
Issue 97
GENERAL BIOLOGY
UDK: 597.54-146.56: 597-147.3: 577.11 (262.81)
STUDY OF THE REPRODUCTIVE POTENTIAL OF ALOSA CASPIA CASPIA (EICHWALD, 1838) IN THE RUSSIAN ZONE OF THE CASPIAN SEA
KOZLOVA Natalya V.,
MAKEEVA Olga V.,
TAIBOV Pirmurad S.
The research aim was to study the reproductive potential of the Alosa caspia caspia (Eichwald, 1838) in the Russian zone of the Caspian Sea during 2020, 2022-2023. Ichthyological, histological, and biochemical research methods were used in the work. Fish mass and length were measured. Classical histological methods were applied to study the maturity stages of fish gonads and disturbances in oocytes. Concentrations of total lipids and water-soluble protein were determined in muscle tissue and gonads. The research revealed that in female Alosa caspia caspia during the spring period in the Caspian Sea, stage IV gonad maturity predominated. The beginning of spawning and the release of the first batch of eggs were recorded in the specimens. During gonad maturation in the study period, disturbances in oogenesis were registered. In stage IV maturity ovaries, the individual resorption index ranged from 9 to 33% of oocytes. Statistical analysis of biochemical data showed a unidirectional nature of protein metabolism in the organism during the spawning period. A redistribution of biochemical substrates in the organs was noted, aimed at optimizing general energy costs for performing the organism's reproductive function. The level of lipid and protein reserves in the fish organism, serving as an indicator of the population's well-being and its reproductive properties, is stable, except for 2020, when a reduced level of water-soluble protein in the muscles was noted, which is likely explained by the organism's compensatory costs for realizing the reproductive function.
Pages: 11 - 16
Date: 30.08.2025