基于水温垂直结构的南海北部近海竹鱼渔场分析

Fishing ground analysis of Japanese horse mackerel in northern South China Sea based on vertical structure of water temperature

根据南海北部近海资源调查项目2014—2015年调查数据,分析了南海北部竹鱼(Trachurus japonicus)渔场与不同水层温度和水温垂直结构的关系。研究表明,渔场位置与水温梯度密切相关,不同季节渔场位置与温度梯度关联系数不同。春季航次渔场位置与20~25 m水层水温梯度关联度最高,夏季航次渔场位置与表层和50 m水层关联度高,秋季航次渔场位置与10~15 m水层关系密切,冬季航次渔场位置与15~20 m水层温度梯度关联度最高。研究表明,南海北部竹鱼渔场对水温梯度变化很敏感,渔场春夏季主要位于北部湾海域,秋冬季主要位于雷州半岛海南岛东部附近海域等水温梯度的高值区。

According to the survey data of the investigation of offshore resources in the northern South China Sea during 2014-2015, we analyzed the relationship among the fishing ground, vertical structure of temperature and water temperature in that area. The results show that the location of fishing ground was closely related to water temperature gradient, and the correlation coefficient of location of fishing ground and temperature gradient was different in different seasons. The correlation between location of fishing ground and temperature gradients of 20？25 m water layer was the highest in spring survey. There was high correlation between location of fishing ground and at the surface layer and 50 m water layer in summer survey. The location of fishing ground was closely related to the water layer of 10？15 m in autumn survey, and the correlation between fishing location and temperature gradient at 15？20 m water layer was the highest in winter survey. It is also found that the fishing ground of the northern South China Sea was sensitive to the change of water temperature gradient. The fishing ground was mainly located in the Beibu Gulf in spring and summer, and mainly in the sea area near the east of Hainan Island in Leizhou Peninsula during autumn and winter.