2012年秋冬季利文斯顿岛南极磷虾渔业CPUE指标变动及其影响因素

摘要

基于南极磷虾渔业科学观察员收集的南极磷虾渔业数据,对2012年秋冬季利文斯顿岛南极磷虾渔业单位捕捞努力量产量(CPUE)的两个指标[单位作业小时产量(CH)和单位扫海面积产量(CPUA)]的变化及其影响因素进行了研究.结果表明:该水域南极磷虾渔业CH和CPUA分别为0～84.0 t/h和0～15.0 ×103 t/km2,平均值分别为10.0 t/h和4.7×103 t/km2；作业水域主要集中在利文斯顿岛西部水域；南极磷虾丰度较高的时间在8:00～16:00,而其他时间段则并非该渔业的最佳作业时段；46.2％的作业区域表温为-0.4-0.2℃,43.4％的作业拖曳深度为40～60 m,78.3％的作业区域均在100 m以浅的水域.%The catch per unit effort (CPUE) including catch per hour (CH) and catch per unit sweeping area (CPUA) and their impacting factors were evaluated in Antarctic krill Euphausia superba fishery in Livingston Island during fall-winter of 2012 based on the catch data collected by the Antarctic krill fishery observers.The results showed that the two fishing indicators were found to range from 0 to 84.0 t/h in CH and from 0 to 15.0×103 t/km2 in CPUA,with average CH of 10.0 t/h and average CPUA of 4.7 × 103 t/km2.The main fishing ground was found in the western Livingston Island,and the higher abundance of Antarctic krill was observed from 8:00 to 16:00,while the other time was not the optimal fishing time.About half of fishing operation (46.2％) was found at sea surface temperature from-0.4 to-0.2 ℃ and the trawling (43.4％) was carried out at depth from 40 m to 60 m,the predominant fishing ground in the shallow area at depth of below 100 m.