Reproductive biology of Oxygymnocypris stewartii in the Yarlung Zangbo River in Tibet, China
We determined the gonadal histology, reproductive characteristics and implications for management of Oxygymnocypris stewartii from individuals collected in the Yarlung Zangbo River. Based on the analyses of gonad development and the size distribution of oocytes, O. stewartii spawns just once each ye...
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Veröffentlicht in: | Environmental biology of fishes 2013-04, Vol.96 (4), p.481-493 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We determined the gonadal histology, reproductive characteristics and implications for management of
Oxygymnocypris stewartii
from individuals collected in the Yarlung Zangbo River. Based on the analyses of gonad development and the size distribution of oocytes,
O. stewartii
spawns just once each year. Peak spawning occurred between late March and early April, when water temperature exceeded 5°C. The standard lengths and the ages at 50 % maturity for males and females were 273 mm and 357 mm, and 5.1 year and 7.3 years, respectively. The mean fecundity of 34211 and mean relative fecundity of 25.4 eggs per gram of fish body weight suggest that
O. stewartii
might be especially vulnerable to exploitation. |
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ISSN: | 0378-1909 1573-5133 |
DOI: | 10.1007/s10641-012-0031-4 |