Status of zander and roach breeders and their availability on spawning and rearing fish farms of flood recession type in the Krasnodar Krai
In 2017–2019, studies were carried out to define the morphological and biological status and the age composition of the roach and zander breeders that enter spawning grounds in the reservoirs of the Yeysk experimental fish breeding farm and the Beisugsky fish rearing farm. To assess if the breeders were ready to spawn, such indicators were studied as weight, length, fecundity, gonad maturity and condition factors. The spawning stocks of roach and zander were found to include, primarily, young fish, such as 2–3-year-old roach and 2–4-year-old zander; therefore, the main morphological and biological indicators of the fish were worse than in previous years. Supply of roach and zander breeders to the spawning grounds is shown. The number of roach breeders on the farms was, generally, higher than the standard set for the spawning ponds, except for the year of 2019 in the Beisugsky fish rearing farm (69.8 nests/ha). The density of zander breeders at the spawning grounds of both farms was by 4–50 times lower than required.
| Main Authors: | , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
2019
|
| Subjects: | Roach, Zander, Breeders, Spawning grounds, Fecundity, Maturation coefficients, Population density, Тарань, Судак, Выростное хозяйство, Популяционная динамика, Возрастной состав, Нерестовые стада, ASFA_2015::A::Age composition, ASFA_2015::S::Spawning populations, ASFA_2015::F::Fish farms, |
| Online Access: | http://hdl.handle.net/1834/16273 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|