Age and growth of Schizopygopsis younghusbandi younghusbandi in the Yarlung Zangbo River in Tibet, China
Age and growth of Schizopygopsis younghusbandi younghusbandi in the Yarlung Zangbo River in Tibet, China
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DOI：
10.1007/s10641-008-9370-6
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发表时间：
2009-09-01
影响因子：
1.4
通讯作者：
He, Dekui
中科院分区：
文献类型：
--
作者：
Chen, Feng;Chen, Yifeng;He, Dekui
雅鲁藏布江裂殖吸虫是雅鲁藏布江中游特有物种，是该地区重要的经济鱼类之一。对2002年10月至2005年4月采集的606个标本的年龄和生长进行了研究。标准身长(L)范围为65.7~387.3 mm，总体重(W)为3.3~772.0 g，L与体重的关系为：男=0.000909L(2.2493)，女=0.000259L(2.4781)。根据肛门鳞片和耳石确定的年龄从3岁到18岁不等。冯·贝塔兰菲生长函数的参数：男L=442.7 mm L，k=0.0738岁(-1)，t(0)=-1.4年；女L=471.4 mm L，k=442.7岁(-1)，t(0)=0.2年。男性和女性在生长方面表现出显著的统计学差异。X(2)检验表明，von Bertalanffy生长函数能很好地描述杨氏沼虾的生长。雄虫寿命为39.2岁，雌虫寿命为38.2岁。男性和女性的生长拐点分别为10.2年和12.0岁，但84.8%的捕获年龄在较小的年龄。因此，迫切需要考虑对这一群体的保护和管理方案。此外，我们还发现，来自拉萨河上游、拉萨河下游和雅鲁藏布江中游的种群在生长方式上表现出显著的差异。
Schizopygopsis younghusbandi younghusbandi is an endemic species whose distribution is restricted to the middle reaches of the Yarlung Zangbo River, being one of the most important commercial fishes in this area. Age and growth of 606 specimens captured between October 2002 and April 2005 were studied. The range in standard length (L) was 65.7-387.3 mm and total weight (W) was 3.3-772.0 g. The relationship between L and W was W=0.000909L(2.2493) for males and W=0.000259L(2.4781) for females. Age, determined from anal scales and lapillus otoliths, ranged from 3 to 18 years. The parameters of von Bertalanffy growth functions, estimated by back-calculated length, were L-infinity = 442.7mm L, k=0.0738 year(-1) and t(0)=-1.4 year for males, and L-infinity = 471.4mm L, k=0.0789 year(-1) and t(0)=0.2 year for females. Males and females exhibited statistically significant differences in growth. chi(2)-test indicated that von Bertalanffy growth functions could well describe the growth of S. y. younghusbandi. The longevities were 39.2 and 38.2 years for males and females, respectively. Growth inflexion points were 10.2 and 12.0 years for males and females, respectively, but 84.8% of the captures were at the smaller ages. So conservation and management schemes for this population should be considered urgently. In addition, we found that populations from the upstream of the Lhasa River, the downstream of the Lhasa River and the middle reaches of the Yarlung Zangbo River showed statistically significant differences in growth patterns.