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利用我国大型拖网渔船渔业科学观察员收集的南极磷虾体长数据,将研究区域划分成经纬度10’×10’小尺度单元,分析了南极磷虾体长分布的时空特征。结果表明,24个单元的平均体长范围为46.9～55.0 mm,其中最小体长为26.8 mm,最大体长为62.2 mm,各单元间体长分布之间存在显著性差异。在纬度方向,各单元南极磷虾体长分布均存在显著性差异;在经度方向,大部分单元(71.4%)南极磷虾体长分布存在显著性的差异。一半以上(60.3%)的样本分布于40～80 m水层。6个水层间(0～120 m,20 m为间隔),南极磷虾体长分布存在极显著的差异,但各水层南极磷虾平均体长较接近(52.5～53.6 mm)。12月,南极磷虾体长范围为26.8～62.4 mm,平均体长为53.1 mm;1月,体长范围为39.1～62.0 mm,平均体长为52.4 mm。12月中旬明显存在一定数量的小个体南极磷虾,优势体长为32～35 mm,约占总数的10%。
Based on the body length data of Antarctic krill collected by Fisher Scientific Observers of large trawlers in China, the study area is divided into 10 ’× 10’ long-latitude units and analyzed the spatial and temporal characteristics of body length distribution of Antarctic krill. The results showed that the average body length of 24 units ranged from 46.9 to 55.0 mm, with the smallest body length of 26.8 mm and the largest body length of 62.2 mm. There was a significant difference between the body length distributions of the units. In the latitudinal direction, there is a significant difference in body length distribution of Antarctic krill between each unit; in the longitude direction, there are significant differences in body length distribution between most units (71.4%) of Antarctic krill. More than half of the samples (60.3%) were distributed in the 40-80 m water layer. There were significant differences in body length distribution between the six aquifers (0-120 m, 20 m intervals), but the average body length of Antarctic krill was close to (52.5-53.6 mm). In December, the body length of Antarctic krill ranged from 26.8 to 62.4 mm with an average body length of 53.1 mm. In January, body length ranged from 39.1 to 62.0 mm with an average body length of 52.4 mm. In mid-December, a certain number of small individual Antarctic krill obviously existed, and the dominant body length was 32-35 mm, accounting for about 10% of the total.