文章摘要
戴小杰.东太平洋热带海域大青鲨繁殖生物学特征[J].水产学报,2005,29(4):
东太平洋热带海域大青鲨繁殖生物学特征
Reproductive biology characteristics of Prionace glauca in the tropical Eastern Pacific Ocean
投稿时间:2014-03-11  修订日期:2014-03-11
DOI:
中文关键词: 大青鲨 繁殖生物学 金枪鱼延绳钓 热带东太平洋
英文关键词: Prionace glauca reproductive biology tuna longline fishing tropical Eastern Pacific Ocean
基金项目:上海水产大学校科研和教改项目,上海市教委资助项目
作者单位地址
戴小杰 上海水产大学海洋学院 上海水产大学海洋学院
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中文摘要:
      大青鲨(Prionace glauca)是一种大型中上层鲨鱼,隶属于真鲨目、真鲨科、大青鲨属.广泛分布在全球热带和温带海域,最大全长可达到300cm,在南海和东海亦有记录.该鱼生活在海洋上层和沿岸海域 .
英文摘要:
      During July-November in 2003, pelagic fish survey was conducted by longliner covering areas of 03?S - 17?S , 96?W - 146?W. Sampling gear was longline fishing. With the precaudal length increment, the total gonad weight of male blue shark increases greatly but that of female increases little. The average value of TGSI(total gonadosomatic index) of female amounts to 0.64 but male increases to 0.98. The blue shark is viviparous and the period of parturition appears in Oct. - Nov, The sex ratio of adult blue shark is not fitted to 1 : 1. Preliminary results show that female matures at total length 183 cm(precaudal length 137cm). The broods range from 13 to 62 and average 34.29 ? 11.2 ( n = 28 ). There is no obvious relationship between broods and maternal length. The length at birth arrives at total length 44cm. Based on the observation of egg diameter in the ovary of female blue shark, the maximum of egg diameter is 16- 18 mm occurred in Nov. and at the same time fertilized eggs appear. Based on the clasper length analysis, the smallest male matures at total length 174 cm (precaudal length 131 cm).
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