Reproductive Biology of Schizothorax o'connori (Cyprinidae: Schizothoracinae) in the Yarlung Zangbo River, Tibet
文献类型： 外文期刊
作者： Ma, Bao-Shan 1 ; Xie, Cong-Xin 1 ; Huo, Bin 1 ; Yang, Xue-Feng 1 ; Chen, Shui-Song 3 ;
作者机构： 1.Huazhong Agr Univ, Coll Fisheries, Wuhan 430070, Hubei, Peoples R China
2.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan 430223, Hubei, Peoples R China
3.Yangtze Valley Water Environm Monitoring Ctr, Wuhan 430010, Hubei, Peoples R China
期刊名称：ZOOLOGICAL STUDIES （ 影响因子：2.058； 五年影响因子：1.786 ）
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收录情况： SCI
摘要： The reproductive biology of Schizothorax o'connori (Cyprinidae: Schizothoracinae) was studied by examining 1126 individuals collected between Aug. 2008 and Aug. 2009 in the Yarlung Zangbo River, Tibet. The population had a significantly higher proportion of females than males (chi(2) test, p < 0.05). Using a logistic regression, it was determined that the standard lengths at 50% maturity were 304 mm for males and 389 mm for females; the ages at 50% maturity were 8 yr for males and 10 yr for females. Based on the monthly proportions of macroscopic gonadal maturity stages and monthly variations in the gonadosomatic index, S. o'connori spawned over a short period, from Feb. to Apr. with a peak in Mar. Females had heavier livers than males for a given eviscerated weight (ANCOVA, p < 0.05). According to the size distribution of oocytes, S. o'connori appeared to show a high degree of spawning synchronicity. The estimated values of fecundity ranged 8228-39,343 (21,190 +/- 6990) eggs/fish. The relative fecundity ranged 6.2-22.2 (14.3 +/- 3.3) eggs/g of fish. The fecundity of S. o'connori increased linearly with the standard length and total weight, but had no significant correlation with age.
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