西北太平洋柔鱼渔场与水温垂直结构关系

Relationship between fishing ground of Ommastrephes bartramii and vertical temperature structure in the northwestern Pacific Ocean

根据2003-2007年8-10月西北太平洋海域不同水层的温度和我国鱿钓船的生产资料,对柔鱼作业渔场分布及其与不同水层(5m、50m、100m、200m)的温度、水温垂直结构(100-200m水温差)进行分析。结果表明,8-10月柔鱼中心渔场主要分布在151°～156°E、41°～44°N海域,各月柔鱼中心渔场形成的水温垂直结构有所差异。8月中心渔场各水层(5m、50m、100m、200m)的水温及100～200m水温垂直梯度的适宜范围分别为17～21℃、9～12℃、3～9℃、2～7℃和0～0.03℃/m,9月分别为15～18℃、8～11℃、3～6℃、2～5℃和0～0.02℃/m,10月分别为14～17℃、7～9℃、2～8℃、3～6℃和0～0.02℃/m。分析还认为,中心渔场主要分布在各水层水温锋面的暖水一侧。

In this study the temperature at different layers （5 m,50 m,100 m and 200 m） and the temperature structure （difference of water temperature between 100m and 200m） in the fishing ground of O.bartramii are analyzed based on the fishing data from Chinese squid jigging fleets in the northwestern Pacific Ocean and temperature data from August to October in 2003-2007. The results indicate that the fishing ground of O.bartramii is distributed in the waters of 151-156°E and 41-44°N during August and October,and the monthly temperature vertical structure is different in the fishing ground of O.bartramii. The optimal range of temperature at 5 m,50 m,100 m and 200 m layers and the difference of temperature from 100m to 200 m in the fishing ground of O.bartramii are 17-21 ℃,9-12 ℃,3-9 ℃,2-7 ℃ and 0-0.03 ℃/m respectively in August. And they are 15-18 ℃,8-11 ℃,3-6 ℃,2-5 ℃ and 0-0.02 ℃/m respetively in September,14-17 ℃,7-9 ℃,2-8 ℃,3-6 ℃ and 0-0.02 ℃/m respectively in October. The results also indicate that the fishing ground is distributed in the warm side of front at different water layers.