中西太平洋延绳钓兼捕大青鲨渔获率、性比及叉长分析研究  

A study on catch rate,sex ratio and fork length of blue shark(Prionace glauca)in longline fishing in Western and Central Pacific Ocean

作　　者：孙康 戴小杰[1,2] 吴峰[1,2] 高春霞[1,2] SUN Kang;DAI Xiaojie;WU Feng;GAO Chunxia(College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;Collaborative Innovation Center for Distant-Water Fisheries/National Engineering Research Center for Distant-Water Fisheries/Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education,Shanghai 201306,China)

机构地区：[1]上海海洋大学海洋科学学院,上海201306 [2]国家远洋渔业工程技术研究中心/大洋渔业资源可持续开发教育部重点实验室,上海201306

出　　处：《南方水产科学》2021年第2期28-35,共8页South China Fisheries Science

基　　金：鲨鱼保护行动计划(17190008);农业部远洋渔业观察员项目(08-25)。

摘　　要：大青鲨(Prionace glauca)是一种分布广泛的大型中上层远洋性鲨鱼,在以金枪鱼等经济鱼种为目标的延绳钓渔业中渔获率较高。根据中国远洋延绳钓渔船2015—2018年在中西太平洋(Western Central Pacific Ocean,WCPO)海域共51个航次采集的兼捕大青鲨数据,分析了该海域兼捕到的大青鲨渔获率、性别及叉长(Fork length,FL)特征。结果显示,大青鲨兼捕的捕捞努力量渔获量(Catch per unit effort,CPUE)在170°30'E—124°50'W、33°30'N—34°40'S范围内分布较高;2015—2018年间大青鲨兼捕CPUE波动较大,以2017年最高,兼捕CPUE与月份之间无显著性差异(P>0.05);大青鲨的雌、雄个体分布范围基本一致,优势叉长区间均为160~220 cm,各自所占比例为89.26%和85.19%,雌、雄个体的叉长分布存在显著性差异(P<0.05),雌雄比例为1.75。Blue shark(Prionace glauca)is a widely distributed pelagic species with relatively high catch rate of longline fishery targeting tunas.Based on the 51-trip observer data for the blue sharks collected in the Western Central Pacific Ocean during 2015–2018,we anayzed their catch rate,sex proportion and fork length.The results show that higher catch per unit effort(CPUE)was found in the area of 170°30'E-124°50'W and 33°30'N-34°40'S.It is noted that the CPUE fluctuated greatly during 2015-2018(highest in 2017).There was no significant difference between CPUE and month(P>0.05).The distribution range of male and female was basically the same.The sex ratio for female and male was 1.75.The dominant fork length(FL)for both male and female ranged from 160 cm to 220 cm,accounting for 89.26%and 85.19%,respectively.There was significant distribution difference between male length and female length by t-test(P<0.05).

关 键 词：大青鲨 延绳钓 渔获率 性比 叉长 中西太平洋 

分 类 号：S977[农业科学—捕捞与储运]