Reproduction results of the semi-anadromous fish species at the floodplain spawning and rearing farms (hatcheries) of the Azov Sea and Kuban River region in 2020
Long-term observations over floodplain spawning grounds reveal the decrease in reproductive efficiency of zander (pike-perch) (Sander lucioperca, Linnaeus, 1758) and roach (Rutilus rutilus heckelii, Nordmann, 1840), resulting from deterioration of hydrological and hydrochemical regimes. Due to its low water content, the year of 2020 has been recorded as most unfavorable for the reproduction of semi-anadromous fish species. This article considers the results of 2020 spawning migration at the spawning and rearing farms of a floodplain type (Beysug Hatchery and Yeysk Experimenal Hatchery). In the spring season of 2020, these two farms reached planned stocking amount of breeders. The best age, length and weigh characteristics were exhibited by the roach breeders entering the water bodies of Yeysk Experimenal Hatchery for spawning. At Beysug Hatchery, the quality of breeders belonging to the semi-anadromous fish species was at its average long-term level. Despite substantial entry of breeders to the water bodies of Yeysk Experimental Hatchery, abundance of the roach juveniles migrating down to the Azov Sea was almost 9 times lower than average long-term values, and for zander juveniles this value was 3 times lower. In Beysug Hatchery, due to low water content, abundance of zander juveniles during their downward migration was 22 times lower (in a long-term context).
| Main Authors: | , , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
2021
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| Subjects: | Spawning migrations, Semi-anadromous species, Juveniles, Rutilus rutilus heckelii, Sander lucioperca, Тарань азовско-черноморская, Судак обыкновенный, Молодь, Пойменные нерестилища, Размерно-массовый состав, ASFA_2015::H::Hatcheries, ASFA_2015::F::Floodplains, ASFA_2015::S::Spawning grounds, |
| Online Access: | http://hdl.handle.net/1834/41445 |
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