1993 bottom trawl survey of the eastern Bering Sea continental shelf
1993 bottom trawl survey of the eastern Bering Sea continental shelf
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1993年白令海东部大陆架底拖网调查
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
D. Nichol
中科院分区：
文献类型：
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作者：
C. E. Armistead;D. Nichol
阿拉斯加渔业科学中心的资源评估和保护工程部每年进行底拖网调查，以监测白令海东部大陆架底层鱼类和螃蟹种群的状况。标准研究区域自 1979 年起每年进行调查，涵盖白令海东部陆架 20 米和 200 米等深线之间的主要部分，以及从阿拉斯加半岛北部到大约圣马修岛纬度 (60E50NN) 的区域。 2004年，两艘特许拖网渔船，40米长的F/V Arcturus和40米长的F/V Aldebaran，再次对该地区进行了调查。在覆盖调查区域的 20 × 20 海里网格中心的站点，通过拖网捕鱼 30 分钟对底层种群进行采样。在每个站点，捕获的物种组成都被确定。从生态和商业上重要的物种中收集长度分布和年龄结构样本。对 395 个站点进行了采样。鱼类生物量以狭鳕和太平洋鳕鱼为主（4.4 吨）。调查中共鉴定出 229 种无脊椎动物。本报告中提出的调查结果包括调查船只的相对捕捞能力、鱼类和无脊椎动物的丰度估计、重要鱼类的地理分布以及主要鱼类的体型构成。还显示了每个采样站记录的表面和底部温度。附录提供了站点数据、物种列表以及抽样种群丰度分析和生物数据的详细结果。
The Resource Assessment and Conservation Engineering Division of the Alaska Fisheries Science Center conducts annual bottom trawl surveys to monitor the condition of the demersal fish and crab stocks of the eastern Bering Sea continental shelf. The standard study area, surveyed each year since 1979, encompasses a major portion of the eastern Bering Sea shelf between the 20-m and the 200-m isobaths and from the Alaska Peninsula north to approximately the latitude of St. Matthew Island (60E50NN). In 2004, two chartered trawlers, the 40-m F/V Arcturus and the 40-m F/V Aldebaran, again surveyed this area. Demersal populations were sampled by trawling for 30 minutes at stations centered in a 20 × 20 nautical mile grid covering the survey area. At each station, species composition of the catch was determined. Length distributions and age structure samples were collected from ecologically and commercially important species. 395 stations were sampled. Fish biomass was dominated by walleye Pollock and Pacific cod (4.4 metric tons). A total of 229 invertebrate species were identified in the survey. Survey results presented in this report include relative fishing powers of the survey vessels, abundance estimates for fish and invertebrates, geographic distributions of important fish species and size composition of principal fish species. Surface and bottom temperatures recorded at each sampling station are also presented. Appendices provide station data, species listings, and detailed results of analyses of abundance and biological data of the sampled populations.