车牛山岛铠平鲉繁殖群体生物学研究

The Fisheries Biology of Sebastes hubbsi in Che-Niushan Island

利用2009年12月在海州湾车牛山岛调查采集的60尾标本,初步研究该海域铠平鲉群体的繁殖群体生物学特征。铠平鲉繁殖群体体长范围64～119mm,体质量范围6.4～60.2g,年龄组成Ⅱ～Ⅷ龄,性比1.5∶1,以Ⅳ龄和Ⅴ龄组占优势,成熟个体最低年龄为Ⅱ龄,最高年龄为Ⅷ龄。绝对怀卵量变动于327～7 706粒之间,平均3 387粒;相对怀卵量变动于29～204粒/g,均值126粒/g。绝对怀卵量与纯质量的关系为E=126 W-326.27,与体长的关系为E=6×10-7 L4.352。以矢耳石切片为材料鉴定年龄并用Von Bertallanffy方程描述其生长,结果显示雌雄生长差异显著,生长方程分别为雌性Lt=135.5×(1-e-0.158×(t+3.578)),雄性Lt=136.9×(1-e-0.148×(t+3.289))。根据生态参数判断,铠平鲉属于偏k-选择型鱼类。

Based on 60 samples collected in December 2009 in Haizhou bay,this paper deals with the fisheries biology of Sebastes hubbsi（Matsubara） in Che-niushan island.The results are summarized as follows： 1） The body length of breeding population ranges from 64 to 119 mm,the weight ranges from 6.4 to 60.2 g.Groups are composed of Ⅱ~Ⅷ ages,sex ratio is 1.5∶1,the Ⅴ and Ⅵ ages dominate.The minimum mature age is Ⅱ and the maximum Ⅷ.2） the individual absolute fecundity E（ind） ranges from 327 to 7706（mean 3387）.The individual relative fecundity E/W（ind/g） ranges from 29 to 204（mean 126）.The relationship between the individual absolute fecundity E（ind）and net weight W（g） is expressed as： E=126W-326.27.The relationship between the individual absolute fecundity E（ind） and body length L（mm） is expressed as： E=6×10-7L4.352.3） Using the sectioned sagittae for age determination,and the growth of Sebastes hubbsi corresponds to von Bertallanffy growth equation.The results show significant difference existed between male and female,equations are as follows： female：Lt=135.5×（1-e-0.158×（t＋3.578））,male： Lt=136.9×（1-e-0.148×（t＋3.289））.4） According to the population fecundity and other ecological parameters,the life-history pattern of Sebastes hubbsi tends to be k-selected.