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DUAN Youjian, HUO Bin, MA Baoshan, YANG Xin, XIE Congxin. Reproductive biology of Schizopygopsis younghusbandi Regan 1905 (Cyprinidae: Schizothoracinae) in the middle reaches of Yarlung Tsangpo River, China[J]. Journal of Oceanology and Limnology, 2018, 36(5): 1825-1834 |
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Reproductive biology of Schizopygopsis younghusbandi Regan 1905 (Cyprinidae: Schizothoracinae) in the middle reaches of Yarlung Tsangpo River, China |
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| DUAN Youjian1, HUO Bin2, MA Baoshan3, YANG Xin4, XIE Congxin2 |
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1 School of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China;
2 College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China;
3 Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China;
4 Hunan Fisheries Research Institute, Changsha 410153, China |
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| Abstract: |
| The reproductive biology of Schizopygopsis younghusbandi (Cyprinidae:Schizothoracinae) was studied by 719 individuals that collected from August 2008 to August 2009 in the middle reaches of Yarlung Tsangpo River, China. We coupled monthly variations of the gonadosomatic index (GSI), monthly proportions of the macroscopic maturity stages with size distribution of oocytes to evaluate spawning seasons. Taken as a set, these results indicated that S. younghusbandi spawned from March to April with high degree of the spawning synchronicity. The standard lengths and the ages at 50% maturity for male were 222 mm and 4.4 year, and 308 mm and 7.0 year for female. In addition, the estimated mean fecundity and mean relative fecundity were 18682 and 57.8 eggs per g body weight. The fecundity of S. younghusbandi increased linearly with increasing of standard length and body weight. This study provides details about the S. younghusbandi reproduction suggesting that may be this species is vulnerable to exploitation in the middle reaches of Yarlung Tsangpo River. |
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| Key words:
reproduction|fecundity|spawning season|Tibet
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| Received: 2017-06-09 Revised: |
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