东南太平洋金枪鱼延绳钓大眼金枪鱼钓获率与水温结构因子的关系  

Relationship between temperature structural variances and hooking rates of bigeye tuna (Thunnus obesus) in tuna longline of Southeastern Pacific Ocean

作　　者：朱国平[1,2] 许柳雄[1] 戴小杰[1] 

机构地区：[1]上海水产大学海洋学院,上海200090 [2]上海市高校大洋生物资源开发和利用重点实验室,上海200090

出　　处：《海洋环境科学》2009年第5期511-515,共5页Marine Environmental Science

基　　金：上海市重点学科建设项目资助(T1101);农业部渔业局金枪鱼渔业科学观察员项目(SFU06472);上海水产大学博士启动基金(B-8202-07-0279);上海高校选拔培养优秀青年教师科研专项基金(D-8003-08-0022)

摘　　要：利用2003年6～11月东南太平洋中国金枪鱼延绳钓渔船海上调查所获得的数据,分析了东南太平洋金枪鱼延绳钓大眼金枪鱼钓获率与水温结构因子及钓钩布设深度。结果显示,东南太平洋中国金枪鱼延绳钓钓钩布设深度主要分布在100～300 m水层（83%）。表温（SST）及100～250 m水层的水温与大眼金枪鱼钓获率有极显著的关系;275 m水层的水温与大眼金枪鱼钓获率存在显著的关系;300 m水层的水温与大眼金枪鱼钓获率无显著关系;温跃层厚度及温跃层上下限温差与大眼金枪鱼钓获率存在显著关系。大眼金枪鱼在分布上主要以热带水域为主;较浅或较深水层钓获率及高钓获率水温分布范围较窄,而150～250 m水层钓获率及高钓获率水温分布范围相对较宽。Based on the data obtained from survey in situ by Chinese tuna longline vessels operating in the Southeastern Pacific Ocean from Jun. to Nov. 2003, the relationship between the temperature structural variances and hooking rate of bigeye tuna captured and the depth distribution of hooks was analyzed. The results show that the most of hooks are ranged from 100 to 300 m water layer （83 % ）. Obviously significant correlation can be found to the relationship between hooking rate of bigeye tuna and SST, water temperature froml00 to 250 m water layer. The significant correlation can show that the relationship between hooking rate of bigeye tuna and water temperature of 275 m water layer, however, there is no significant correlation between hooking rate of bigeye tuna and water temperature of 300 m water layer. It can also find the differences between temperature or width of thermocline and hooking rate of bigeye tuna. The dominant distribution of bigeye tuna is located in the tropical waters. The distribution ranges of water temperature are narrow to the hooking rate or higher hooking rate of bigeye tuna in shallower or deeper water layer. However, the wider range of temperature can be found in the hooking rate or higher hooking rate for 150 to 250 m water layer.

关 键 词：大眼金枪鱼 水温 钓获率 东南太平洋 

分 类 号：S931.1[农业科学—渔业资源]