南海中部海域渔业资源时空分布和资源量的水声学评估

发布时间：2018-06-29 11:14

本文选题：渔业资源 + 声学评估　；参考：《南方水产科学》2016年04期

【摘要】：2014年3月~2015年2月对南海中部12°N~15°N、111°E~117°E海域进行了4次渔业资源声学调查,其中2014年3月~4月(春季)、11月~12月(秋季)和2015年1月~2月(冬季)利用"南锋"号船载双频分裂波束科学探鱼仪系统(Simrad EK60,38 k Hz、120 k Hz,挪威)进行探测,2014年7月~8月(夏季)利用便携式分裂波束科学探鱼仪(Simrad EY60,70 k Hz,挪威)进行探测。通过鱼类目标强度现场测定,使用回波积分法获得了调查海域内渔业资源的丰度密度空间分布的季节变动特征。结合夏季调查灯光罩网采样数据,分析了调查海域内评估对象种类组成并估算资源总量。结果表明,夏季共捕获鱼类18种,头足类2种,其中鸢乌贼(Sthenoteuthis oualaniensis)为主要渔获种类,声学评估其资源量为2.36×106t,约占评估对象资源总量的73.19%。调查海域内单体目标强度均呈单峰状分布,且主要分布于-56.5~-41.5 d B,4次调查该海域范围内目标强度小于-71.5 d B的单体均分布于100 m以浅水层,而目标强度大于-20.5 d B的单体则均分布于100 m以深水层。
[Abstract]:From March 2014 to February 2015, four acoustical surveys of fishery resources were conducted in the middle of the South China Sea in the area of 12 掳Nao 15 掳N ~ (11) 掳E ~ (117 掳E). Of which, March to April 2014 (spring), November to December (autumn) and January to February 2015 (winter) were detected using the "Nanfeng" dual-frequency split beam scientific fish finder system (Simrad EK60K6038 k Hzn 120 k Hzl, Norway), July 8, 2014. Month (summer) was detected using a portable split beam scientific fish detector (Simrad EY 6010 70 k Hz, Norway). The seasonal variation characteristics of the spatial distribution of abundance density of fishery resources in the investigated sea area were obtained by using echo integration method through the field measurement of fish target intensity. Based on the sampling data of the survey light net in summer, the species composition and the total amount of resources in the investigated sea area are analyzed. The results showed that there were 18 species of fishes and 2 species of cephalopods in summer, among which the main catch species was Sthenoteuthis oualaniensis, and the acoustical assessment of its resources was 2.36 脳 10 ~ 6 t, which accounted for 73.19% of the total resources. The single peak distribution of target intensity was observed in the investigated area, and the monomers with the intensity less than -71.5 dB were mainly distributed in the shallow water layer of 100 m in the sea area for 4 times, mainly distributed in -56.5 ~ 41.5 dB, and the intensity of the target was less than -71.5 dB in the sea area. However, the monomer with target strength greater than -20.5 dB is distributed in 100m deep water layer.
【作者单位】：中国水产科学研究院南海水产研究所农业部南海渔业资源环境科学观测实验站;大连海洋大学海洋科技与环境学院;
【基金】：中央级公益性科研院所基本科研业务费专项资金(中国水产科学研究院南海水产研究所)资助项目(2013ZD03) 农业部财政重大专项(NFZX2013);农业部财政项目“南海海洋捕捞生产结构调查”(640) 国家科技支撑计划项目(2013BAD13B06)
【分类号】：S932

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