上海海洋大学学报2013，Vol.22Issue(2)：289-294,6.
热带中东大西洋拟锥齿鲨生物学的初步研究
Preliminary analysis of the biology of the crocodile shark, Pseudocarcharias kamoharai in the tropical Eastern-central Atlantic Ocean
摘要
Abstract
Crocodile shark, Pseudocarcharias kamoharai, is a common by-catch species of tuna longliner. As an important part of the oceanic food chain, it plays a vital role in the marine ecosystem. According to the total of 383 crocodile shark samples collected by China' s national tuna fisheries observers in the tropical Eastern-central Atlantic Ocean (4.24° - 14.03°N,27.13°-38.28°W), the biological characteristics of both females and males of crocodile sharks were analyzed and described, respectively. The results can be summarized as follows; (1) The female-male ratio was l:0.36, and with significant difference; (2) The dominant fork length of males and females was 75 - 95 cm, 65 - 90 cm, respectively; (3) There was no significant difference between Hepatosomatic indices ( HSI ) and gonad development for male of P. kamohara, however, HSI of mature individuals was greater than that of immature individuals of female; (4) 96. 8% of males and 56. 12% of females were mature. Maturity stages at II and IV of females' gonads were dominant and the size at 50% maturity (L50) of female was 84. 6 cm in fork length; (4) Feeding stage 0 was dominant with the percentage of 52. 38% , and feeding stage 1 accounted for the percentage of 33. 86% ; (5) The prey composition in the stomachs of these shark samples was mainly sardine (72. 56%) and squid (27.44%); (6) The relationships between fork length and round weight for females and males was described by WR =2 × 10-5 LF2.7614, WR =2 × 10-6LF3.3287 respectively. Due to the difficulty for collecting the oceanic species samples, this study contributed to a better understanding of crocodile shark in biological characteristics, and the information from this study would be helpful for some regional fisheries management organizations to conduct stock assessment and decision making.关键词
拟锥齿鲨/金枪鱼延绳钓/生物学特征/热带大西洋Key words
Pseudocarcharias kamoharai/ tuna longline fishery/ biological characteristics/ tropical Easterncentral Atlantic Ocean分类
农业科技引用本文复制引用
高春霞,田思泉,戴小杰,吴峰,许友伟..热带中东大西洋拟锥齿鲨生物学的初步研究[J].上海海洋大学学报,2013,22(2):289-294,6.基金项目
农业部三大洋金枪鱼观察员项目(08-54) （08-54）
