中西太平洋金枪鱼围网黄鳍金枪鱼产量的时空分布及与表温的关系

黄鳍金枪鱼是中西太平洋金枪鱼围网渔业中的重要捕捞种类之一。本文根据2003年中西太平洋金枪鱼围网生产统计及其表温数据,利用频次统计分析和地理信息软件Marine Explorer 4.0对黄鳍金枪鱼产量和单位日产量(CPUE)的时空分布进行分析,探讨其与海水表温的关系。结果显示,产量和CPUE最高的是2月份,其次是9月份,5月份为最低。高产量的范围为140~160°E、0°~5°S;CPUE高值区分布在130°E、0°~15°S,140°~160°E、0°~15°S和175°W、0°~15°S;产量经纬度重心分别为150°30′E和3°48′S。产量主要分布在海表温为28~31℃的海域,产量比重高达95.45%,其中29~30℃产量为最高,占69.54%。

Spatio-temporal distribution of Thunnus albacares and its relationship with sea surface temperature in the tuna purse seine fishery of the Central and Western Pacific

Yellow-finned tuna Thunnus albacares is an important target species of the tuna purse seine fishery in the Central and Western Pacific.Present paper deals with the analyses on the spatio-temporal distribution of the catch and CPUE of yellow-finned tuna based on the catch data and sea surface temperature(SST) during 2003,and by using the method of frequency stastics together with GIS software Marine Explorer 4.0 to inquire into its relationship with SST.The results showed that the highest catch and CPUE were in February,next in September and the lowest in May.The area with high catch was located in the waters of 140°-160°E,0°-5°S,the area with high CPUE were distributed in the waters of 130°E,0°-15°S,140°-160°E,0°-15°S,175°W,0°-15°S.The gravity centre of the annual catch was located in the water of 150°30′E and 3°48′S.The optimum SST for yellow-finned tuna ranged from 28 ℃ to 31 ℃,the catch propotion in total highly occupied up to 95.45%,in which the highest catch was distributed in the waters with 29 ℃-30 ℃ SST,its propotion occupied 69.54% in total.