智利外海茎柔鱼资源密度分布与渔场环境的关系

Study on the resource density distribution of Dosidicus gigas and marine environment in the high sea waters off Chile

根据2006年4—6月我国鱿钓船对东南太平洋智利外海茎柔鱼探捕所获资料，采用效能比方法，对茎柔鱼资源密度指标CPUE值进行了估算。分析表明，整个探捕海域均有茎柔鱼分布，且资源密度较高，但不同区域资源密度有所差异。南部区域（78°30′～84°W，37°30’～41°S），CPUE范围为0．4～10．3尾／线·h，平均2．8肜线·h，高CPUE（5．0尾／线·h以上）区域分布在79°-79°30’W、40°～40°30’S附近。北部区域（76°～78°W，28°～30°S），CPUE范围为1．0—5．6尾／线·h，平均3．1尾／线·h，高CPUE（5．0尾／线·h以上）区域分布在28°30’S、77°W附近。南部和北部区域的温盐结构差异显著，南部区域各层的水温和盐度均低于北部区域相应水层。经分析，南部区域CPUE与上层（25～75m）水温和深水层（300～325m）盐度的关系较为密切，北部区域CPUE与深层水温（150—250m）和盐度的关系较为密切。

Based on the investigation and the catch of Dosidicus gigas in the sea off Chile from April to June in 2006, the resource density index（CPUE） is calculated by the way of efficiency ratio. The results indicate that Dosidicus gigas are widely distributed in the investigation area and the resource density is relatively high, but the resource density varies with different fishing areas. In the south area （78°30＇ - 84°W, 37 °30＇ - 41°S）, the value of CPUE ranges from 0.4 to 10.3 squids per line in one hour, the average CPUE is 2.8, and the highest CPUE which above 5.0 is around the area of 40° ～ 40°30＇S and 79°- 79°30＇W. In the north area（76°- 78° W,28° -30°S）, the value of CPUE ranges from 1.0 to 5.6, the average CPUE is 3.1, and the highest CPUE which above 5.0 is around 28°30＇S,77°W . Water temperature and salinity in different layers is greatly lower in the south area than that in the north area. CUPE is closely related to water temperature in 25 -75 m layer and salinity in 300 -325 m layer in the south area whereas CPUE is related to water temperature and salinity in 150 -250 m layer in the north area.