热带东太平洋拟锥齿鲨的繁殖生物学特性

Reproductive biology characteristics of Pseudocarcharias kamoharai in the tropical Eastern Pacific Ocean

摘要: 研究根据科学观察员在热带东太平洋海域2次调查，调查时间和海域分别为2003年7~11月的03S~17S，96W~146W范围，2006年2~11月的05N~10S，134W~173W范围。调查共测定了202尾拟锥齿鲨（Pseudocarcharias kamoharai）的样本，并对其进行分析。结果表明，拟锥齿鲨全长（TL）与全重（W）的关系，雌性是W=910-5TL2.3116，雄性是W=910-6TL2.9007。其雌雄性比接近1:1。雌性拟锥齿鲨的总性腺重量随体长增加而增加，增加幅度较大；雌性拟锥齿鲨性成熟的最小TL约为89 cm，雄性大约在85~100 cm。雌体怀仔数量平均为3.85尾。出生时的TL约为40 cm左右。

Abstract: Based on the scientific observers surveys in tropical Eastern Pacific Ocean covering areas 03S~17S, 96W~146W and 05N~10S, 134 W~173W during July~Nov. 2003 and Feb.~Nov. 2006 respectively, 202 specimens of crocodile sharks (Pseudocarcharias kamoharai) were collected and analysed. The result showed that the relationship between total length and total weight of crocodile isW=910-5TL2.3116 for female andW=910-6TL2.9007 for male. The sex ratio of crocodile shark was nearly 1:1. Female crocodile sharks total gonad weight was increased with the growth of total length, female crocodile shark adult matured at about 89cm, males adult about 85~100cm. The brood of crocodile is 3.85, and size at birth is 40 cm.