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

作　　者：戴小杰[1] 许柳雄[1] 

机构地区：[1]上海水产大学海洋学院,上海200090

出　　处：《水产学报》2005年第4期565-569,共5页Journal of Fisheries of China

基　　金：上海水产大学校长基金资助(科02-48);上海市教委青年基金(科02-177)

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).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）.

关 键 词：大青鲨 繁殖生物学 金枪鱼延绳钓 热带东太平洋 

分 类 号：S931.1[农业科学—渔业资源]