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根据2013年1–9月辽宁远洋渔业有限公司“福荣海”轮南极磷虾拖网调查数据,以3n mile/h拖曳获得的产量作为CPUE指标,对南极磷虾资源时空分布进行了分析。结果显示,1–6月的月均CPUE值相对稳定,7–9月逐月下降。各渔区中平均CPUE值以48.1区最高,为(25.12±31.04)t/h;48.3区最低,为(11.49±12.06)t/h;CPUE值的波动幅度48.1区大于48.2和48.3区。48.1区的南极磷虾群主要分布于0–100 m水层,CPUE值以25–50 m水层为最高;48.2区虾群主要分布于50–150 m水层,CPUE值以100–150 m水层最高;48.3区虾群主要分布于100–250 m水层,CPUE值以200–250 m水层最高。海底深度<500 m的近岸海域是磷虾主要集群分布区和商业捕捞渔场,以水深<250 m的浅水区渔场虾群密度最大,平均CPUE值为(17.54±35.26)t/h,水深250–1500 m的深水区渔场平均CPUE值变化较小,在12.0–14.0 t/h之间波动,但水深>1500 m时,平均CPUE值降到(9.62±9.54)t/h。作业渔场的表温SST主要集中在-1–2℃,当SST为-1–0℃时,平均CPUE值最高。探捕调查发现了5个主要的磷虾集群,集群时间可达30 d以上,但集群密度随时间发生变化。调查结果可为研究南极磷虾渔场形成机制和渔业管理提供基础数据,并为商业捕捞提供参考。
According to the survey data of “Antarctic krill trawling” of Liaoning Ocean Fisheries Co., Ltd. from January to September 2013, the spatial and temporal distribution of Antarctic krill resources was analyzed with the yield of 3n mile / h tow as the CPUE index . The results showed that the average monthly CPUE value from January to June was relatively stable and declined month by month from July to September. The average value of CPUE in each fishing area was (25.12 ± 31.04) t / h in the 48.1 area, and (11.49 ± 12.06) t / h in the 48.3 area. The fluctuation range of the CPUE value was greater than 48.2 and 48.3 in the 48.1 area. The Antarctic krill population in Section 48.1 is mainly distributed in the 0-100 m water layer with the highest CPUE value in the 25-50 m water layer. The 48.2 zoned shrimp population is mainly distributed in the 50-150 m water layer with a CPUE value of 100-150 m The water layer is the highest. The shrimp in 48.3 area is mainly distributed in the water layer of 100-250 m, and the CPUE value is the highest in the water layer of 200-250 m. The coastal waters with seafloor depth less than 500 m are the main distribution area of krill and commercial fishing ground. The density of shrimp ponds is the highest in shallow water area with water depth <250 m, average CPUE value is (17.54 ± 35.26) t / h and water depth is 250 The mean value of CPUE in deep-water fisheries of -1500 m fluctuated slightly between 12.0-14.0 t / h, but the average CPUE dropped to (9.62 ± 9.54) t / h at depth> 1500 m. The surface temperature SST of the operation fishery mainly concentrates at -1-2 ℃. When the SST is -1-0 ℃, the average CPUE value is the highest. The investigation found five major krill clusters with a cluster time of more than 30 days, but the cluster density varied with time. The findings provide basic data for studying the formation mechanism and fishery management of Antarctic krill fisheries and provide reference for commercial fishing.