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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

孙康 戴小杰 吴峰 高春霞

孙康, 戴小杰, 吴峰, 高春霞. 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[J]. 南方水产科学. doi: 10.12131/20200221
引用本文: 孙康, 戴小杰, 吴峰, 高春霞. 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[J]. 南方水产科学. doi: 10.12131/20200221
Kang SUN, Xiaojie DAI, Feng WU, Chunxia GAO. A study on catch rate, sex ratio and fork length of blue shark (Prionace glauca) in longline fishing in Western and Central Pacific Ocean[J]. South China Fisheries Science. doi: 10.12131/20200221
Citation: Kang SUN, Xiaojie DAI, Feng WU, Chunxia GAO. A study on catch rate, sex ratio and fork length of blue shark (Prionace glauca) in longline fishing in Western and Central Pacific Ocean[J]. South China Fisheries Science. doi: 10.12131/20200221

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

doi: 10.12131/20200221
基金项目: 鲨鱼保护行动计划 (17190008);农业部远洋渔业观察员项目 (08-25)
详细信息
    作者简介:

    孙康:孙 康 (1996—),女,硕士研究生,研究方向为渔业资源研究。E-mail: 17864284257@163.com

    通讯作者:

    戴小杰 (1966—),男,博士,教授,从事渔业资源评估、渔业生态学研究。E-mail: xjdai@shou.edu.cn

  • 中图分类号: S 977

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

  • 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。
  • 图  1  2015—2018年中西太平洋延绳钓渔业中大青鲨的单位捕捞努力量渔获量累积图

    Figure  1.  CPUE cumulative map of blue shark of longline fishery in Western and Central Pacific during 2015−2018

    图  2  2015—2018年中西太平洋延绳钓渔业大青鲨单位捕捞努力量渔获量年度分布图 (a) 及趋势图 (b)

    Figure  2.  CPUE of blue shark distribution (a) and trend (b) in longline fishing in Western and Central Pacific Ocean during 2015−2018

    图  3  2015—2018年中西太平洋延绳钓渔业中大青鲨渔获比例变化趋势图

    Figure  3.  Blue shark bycatch percentage variation in longline fishing in the Western and Central Pacific Ocean during 2015−2018

    图  4  2015—2018年中西太平洋延绳钓渔业大青鲨的月际CPUE变化图

    Figure  4.  Average CPUE of blue shark in different months in longline fishing in Western and Central Pacific Ocean during 2015−2018

    图  5  2015—2018年中西太平洋延绳钓渔业大青鲨的雌、雄个体分布

    Figure  5.  Distribution of male and female blue sharks of longline fishing in Western and Central Pacific Ocean during 2015−2018

    图  6  中西太平洋大青鲨的叉长频率分布图

    Figure  6.  Fork length frequency distribution of blue shark in Western and Central Pacific Ocean

    图  7  2015—2018年中西太平洋大青鲨的叉长分布

    Figure  7.  Distribution of blue shark fork length in Western and Central Pacific Ocean during 2015−2018

    表  1  2015—2018年中西太平洋延绳钓渔业观察员观察航次表信息

    Table  1.   Observation voyage data of longline fishery in Western and Central Pacific Ocean

    开始时间
    Start time
    结束时间
    End time
    航次
    Voyage
    经度范围
    Longitude range
    纬度范围
    Latitude range
    观察钩次
    Observed hook times
    样本数量
    Sample size
    2015/92016/38107.93°W—157.37°E7.42°N—27.40°S54795
    2016/72017/314105.47°W—161.70°E30.25°N—33.82°S1 247756
    2017/12018/315130.15°W—158.07°E37.33°N—24.80°S1 4762 279
    2018/42019/314143.38°W—144.18°E36.53°N—36.48°S1 728823
    下载: 导出CSV

    表  2  不同海域大青鲨优势叉长和雌雄比例

    Table  2.   Comparison of dominant fork length and proportion of female-male in different sea areas

    海域
    Sea Area
    雌、雄优势叉长
    Dominant forks of male and female/cm
    雌雄比例
    Ratio of male to female
    参考文献
    References
    印度洋西南部海域 Southwest Indian Ocean Sea 150~229.9、150~250 0.89 夏萌[18]
    北大西洋海域 North Atlantic Ocean 180~220、190~230 0.99 高春霞[19]
    南加州湾水域 Southern California Bight 75~95、75~95 1.01 Runcie等[15]
    加勒比海水域 Caribbean Sea 180~260、180~260 Rafael等[1]
    中西太平洋 Western and Central Pacific Ocean 160~220、160~220 1.75 本研究
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-10-22
  • 修回日期:  2021-01-08
  • 网络出版日期:  2021-02-07

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