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闽南近海尖头斜齿鲨的生殖生物学研究

, PP. 92-98

Keywords: 尖头斜齿鲨,生殖生物学

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Abstract:

尖头斜齿鲨(Scoliodonlaticaudus)是暖水性小型鲨鱼,为有胎盘胎生种类.在闽南近海,其雄鱼的性成熟长度为382~448mm,雌鱼的性成熟长度为405~467mm,1994年5月至1995年4月的周年随机采样中,雌鱼在群体中所占比例为53.0%.雌鱼的妊娠开始于1~4月,同年的6~8月分娩,妊娠期为5~6个月.尖头斜齿鲨雌鱼每个子宫一次妊娠怀胚胎1~12尾,其中3~6尾者占67.8%.雌鱼一次妊娠产仔鱼2~24尾,平均9.1尾,其中6~13尾占70%;57%的母体左右子宫内胚胎数相同.胚胎数量随母体全长的增大而呈线性增加.雌性尖头斜齿鲨生殖周期约为2年,一生生殖2~3次,生殖能力较低.尖头斜齿鲨胚胎在分娩时全长138~142mm,与雌鱼性成熟长度的比为0.30~0.35,胚胎的雌雄比为1.17:1.同一子宫内及左右两子宫中的胚胎发育情况均基本相同.另外还讨论了鲨鱼资源的保护和管理问题.

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