利用G IS分析中西太平洋金枪鱼围网渔场的时空变动

根据中西太平洋1984~2003年金枪鱼围网渔业的渔获量统计资料,利用G IS定性分析方法和数值分析方法对中西太平洋海区的金枪鱼围网渔场的时空变动进行研究。研究结果表明:1984年到1991年,CPUE值在12.0~17.3 t/(d.n)之间;1992年至2003年,CPUE值在19.1~27.9 t/(d.n)之间,两个阶段的CPUE差异显著;Ⅰ、Ⅱ和Ⅲ类渔场基本上全部分布在5°S~5°N、140°E~180°之间,但Ⅲ类渔场在南半球略往东延伸,在10~5°S、155°~160°E之间也有分布;Ⅳ、Ⅴ类渔场则分布在Ⅰ、Ⅱ和Ⅲ类渔场的周边,其中Ⅳ类渔场主要位于东经地区,Ⅴ类渔场主要位于西经地区。

Analysis of temporal and spatial fluctuations on purse seine fishery in the Western and Central Pacific Ocean based on GIS technology

Based on the world catch statistic data of tuna purse seine fisheries in the Western and Central Pacific Ocean(WCPO) from 1984 to 2003, the temporal and spatial variations of tuna purse seine fishery resources were analyzed using GIS qualitative analysis and numerical analysis.The results indicated that there were two stages with great differences in the CPUE,the first stage was from 1984 to 1991,the values of CPUE were between 12 to 17.3 t/(d·n) lower than the mean value,19 t/(d·n)];the second stage was from 1991 to 2003,the values were 19.1 to 27.9 t/(d·n) higher than the mean value,19 t/(d·n)].The spatial distribution of the fishing grounds of type Ⅰ,type Ⅱ,and type Ⅲ was between 5°S～5°N、140°E～180°,in which that of type Ⅲ stretched slightly towards the east in the Southern Hemisphere,and it also distributed in 10～5°S、155°～160°E.The fishing grounds of type Ⅳ and type Ⅴ scattered around the fishing grounds of the other three types,in which those of type Ⅳ located in the east of 180° meridian,and those of type Ⅴ in the west of 180° meridian.