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南极磷虾调查CPUE指数变动的影响因素初步分析 被引量:34

Preliminary analysis on factors impacting CPUE index variations in Antarctic Krill survey
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摘要 根据2010年1月~2月在南极南设得兰群岛和南奥克尼群岛周围水域开展的南极磷虾拖网调查期间收集的数据,对南极磷虾CPUE指数变动的影响因素(包括表温、水深、拖速和拖曳深度)进行了分析。结果表明:(1)开始捕捞至结束捕捞的表温相差较小时,平均CPUE相对较高(〉250 kg/min);(2)起放网表温在0.5~1.0℃和1.0~1.5℃时,平均CPUE均较高(〉250 kg/min);(3)当海底平均深度大于2 000 m时,CPUE均最低(〈100 kg/min);(4)随着拖速和拖曳深度的增加,平均CPUE逐渐减小,当拖速小于2.5 kn及拖曳水深小于25 m时,平均CPUE达到最大,分别为364.46 kg/min和347.59 kg/min。本研究结果可为开发南极磷虾资源提供基础数据,并为海上生产提供指导性参考。 Based on the data collected by trawl fishery targeted at Antarctic Krill(Euphausia superba) operating in the Antarctic waters around the South Shetland Islands and the South Orkney Islands from January to February 2010,the factors that impacted on CPUE(Catch Per Unit Effort) index of Antarctic Krill survey,including sea surface temperature(SST),bathymetry,trawl speed and trawl depth were analyzed.Results showed that:(1) The smaller the difference of SST between start fishing and end fishing,the higher the average CPUE index( 250 kg/min);(2) the higher CPUE index( 250 kg/min) occurred when SST intervals were 0.5 ℃ to 1.0 ℃ and 1.0 ℃ to 1.5 ℃ during net deployed or retrieved;(3) the CPUE( 100 kg/min) was lower when the average depth of bathymetry was over 2 000 m;(4) the CPUE index decreased with the increasing trawl speed,and the average CPUE index was larger when the trawl speed was lower than 2.5 knots(CPUE=364.46 kg/min) or the trawl depth was lower than 25 m(CPUE=347.59 kg/min).The present study could provide basic data for exploiting Antarctic krill resources and guide reference for fishing operation in the sea.
出处 《海洋渔业》 CSCD 北大核心 2010年第4期368-373,共6页 Marine Fisheries
基金 国家"863"计划项目(2007AA092202) 南极海洋生物资源开发与利用项目(D-8003-09-0158) 上海市重点学科建设项目(S30702)
关键词 南极磷虾 拖网调查 CPUE指数变动因素 Antarctic krill trawl survey variation factors on CPUE index
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