绰斯甲河大渡裸裂尻鱼的年龄与生长特性研究
Freshwater Fisheries(2012)
Abstract
以绰斯甲河流域大渡裸裂尻鱼(Schizopygopsis malacanthus chengi)的微耳石和脊椎骨为年龄鉴定材料,对其进行了年龄鉴定,并比较了两种年龄鉴定材料的准确性,结果表明微耳石更适合于年龄鉴定.同时,以微耳石磨片为年龄鉴定和生长推算材料,对大渡裸裂尻鱼种群的生长特性进行了研究.结果显示:在相同年龄组内雌鱼个体显著大于雄鱼.雌、雄鱼体重与体长表现为异速生长:W♂ =0.0245×L2.7934,W♀=0.0213×L2.8593.Von Bertalanffy生长方程为雌鱼Lt=32.319×[1-e-0.087×(t+4.024)],Wt =439.165×[1-e-0.087(t+4.024)]2.859;雄鱼Lt=23.195×[1-e-0.213×(t-1.008)],Wt=169.3072×[1-e-0.213×(t-1.008)]2.7934.雌、雄鱼的生长拐点年龄分别为8.1龄和6.0龄,对应的雌鱼体长和体重为L=21.06 cm,W=129.12 g;对应的雄鱼的体长和体重为L=15.18 cm,W=51.85 g.
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Key words
vertebra,lapillus,Chuosijia River,age,Schizopygopsis malacanthus chengi,growth
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