中文摘要：

基于2000～2007年中西太平洋金枪鱼围网生产统计数据及遥感手段获取的海表温度、海面高度、叶绿素浓度等环境数据,利用广义可加模型（GAM）分析了中西太平洋鲣鱼渔场分布及其与时空和环境因子的关系。结果表明：GAM模型对单位捕捞努力量渔获量（CPUE）总偏差解释率为64.40%,其中贡献最大的为经度,贡献率为46.27%。鲣鱼的CPUE呈逐年递增状态;作业渔场全年均有分布,但季节性差异并不明显,其中4月为作业集中月份;鲣鱼作业渔场主要分布在10°S～10°N,140°～175°E范围内;适宜海表温度为28～30℃;适宜的海表面高度为70～100 cm;适宜的叶绿素浓度为0.01～0.20mg/m3。影响渔场的因子按重要性从大到小依次为：经度,纬度,年份,海面高度,海表温度,叶绿素浓度和月份。

英文摘要：

Based on the catch data of purse-seine fishery of WCPO from 2000 to 2007 and the environmental data,including sea surface temperature（SST）,sea surface height（SSH）,chlorophyll a concentration（Chl a） derived from remote sensing,this present study analyzed the fishing ground distribution of skipjack tuna（Katsuwonus pelamis） and its relationships with the spatiotemporal and environmental factors in the Western and Central Pacific Ocean（WCPO） using generalized additive model（GAM）.The results show that the rate of deviance explained about CPUE（catch per unit effort） is 64.40%,the factor that provides the largest contribution is longitude and the contribution rate is 46.27%.The CPUE of skipjack tuna is increasing with year.The fishing grounds of skipjack tuna are distributed throughout the year,but the seasonal difference is not significant,the fishing operation is concentrated in April.The fishing ground of skipjack tuna in the WCPO was mainly located in the waters of 10°S ~ 10°N and 140°E~175°E.The suitable SST ranged from 28 ℃ to 30 ℃.The suitable SSH ranged from 70 to 100 cm.The appropriate Chl a range is 0.01~0.20 mg/m3.The results of stepwise GAM show that the relative importance of the seven variables that affect the fishing ground of skipjack tuna can be followed with the order of longitude,latitude,year,sea surface height,sea surface temperature,chlorophyll concentration and month.