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

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.