太平洋大眼金枪鱼延绳钓渔获分布及渔场环境浅析

Preliminary study on the catch distribution of bigeye tuna (Thunnus obesus) longline and fishing grounds environment in the Pacific Ocean

本文主要根据收集到的渔获量数据、海水表层温度数据和有关文献资料 ,应用GIS技术对太平洋大眼金枪鱼延绳钓渔业进行了定量或定性分析。结果表明 :太平洋大眼金枪鱼延绳钓渔场主要分布在 2 0°N～2 0°S之间的热带海域 ,具纬向分布特征。对渔获产量同海表温度的分月统计显示 :太平洋大眼金枪鱼渔场最适月平均表层水温约 2 8～ 2 9℃ ,渔场出现频次为偏态分布型。最后 ,结合有关文献综合讨论分析了海表温度、溶解氧含量。

The bigeye tuna longline fishery is one of the important fisheries in the Pacific Ocean. Based on the bigeye tuna catch data collected, sea surface temperature derived from satellite 3-level production and literatures,the bigeye tuna longline fisheries were analyzed quantitatively or qualitatively by using GIS technology. The results showed that the distribution of bigeye tuna longline fishing grounds is mainly in the tropical areas between 20°N and 20°S. The analysis of the relationship between catch statistics by month and average SST indicated that the favorite monthly SST of the bigeye tuna longline fishing grounds was 28～29℃. The frequency distribution style of the fishing grounds is the skew one. Finally, the relationship between the distribution and formation mechanism of the fishing grounds and the environment factors such as SST, dissolved oxygen (DO), sea current were herein discussed.