基于水温垂直结构的西北太平洋柔鱼栖息地模型构建

根据1998-2004年8～10月中国大陆西北太平洋柔鱼生产数据,结合对柔鱼渔场与各水层水温的分析,以作业次数为基础建立各水层水温的适应性指数(Suitability Index,SI)模型,采用算术平均法(Arithmetic Mean Model,AMM)和几何平均法(Geometric Mean Model,GMM)建立综合栖息地指数(Habitat Suitability Index,HSI)模型；并对1998-2004年8～10月的HSI值与实际作业次数、产量和单船日产量(CPUE)作比较.结果表明,8～10月,HSI＞0.6时,AMM的产量和作业次数比重分别占83.4％和80.9％,CPUE均2.1 t/d以上；GMM的产量和作业次数比重分别占73.5％和69.6％,CPUE均2.3 t/d以上.2种模型比较认为,AMM模型稍优于GMM模型.同时,利用2005年8～10月生产数据及水温资料对HSI模型进行验证.结果表明,基于水温垂直结构的栖息地指数模型能较好地预测西北太平洋中心渔场和潜在渔场.

Modeling of Habitat Suitability of Neon Flying Squid (Ommastrephes bartramii) Based on Vertical Temperature Structure in the Northwestern Pacific Ocean

Based on the data of Ommastrephes bartramii from Chinese jigging fleets during August to October from 1998 to 2004,the Suitability Index(SI) models were used to map habitat quality for O.bartramii on the different water temperature in the Northwestern Pacific Ocean.The integrated Habitat Suitability Index(HSI) model was established with Arithmetic Average Method(AMM) and Geometric Mean Method(GMM),and the HSI values were compared with the actual fishing effort,catch and CPUE during August to October from 1998 to 2004.When the HSI value was greater than 0.6 in the fishing ground,the results from AMM showed that the percentage of catch and fishing effort were 83.4% and 80.9% respectively,and the CPUEs were all above 2.1t/d.While the results from GMM showed that the percentage of catch and fishing effort were 73.5% and 69.6% respectively,and the CPUEs were all above 2.3t/d.AMM was better than the GMM to analyse the actual fishing data during 1998 to 2004.As estimated from AMM,the HSI was further verified by the catch data in 2005.The results showed that the HSI model based on vertical temperature structure can better predict the main fishing ground and potential fishing ground of O.bartramii in the Northwestern Pacific Ocean.