中国水产科学Issue(3)：660-671,12.DOI:10.3724/SP.J.1118.2013.00660
热带印度洋大眼金枪鱼垂直分布空间分析
Vertical distribution of bigeye tuna Thunnus obesus in the tropical In-dian Ocean
摘要
Abstract
We evaluated the isothermal distribution of subsurface temperatures in the bigeye tuna (Thunnus obesus) fishing grounds in the tropical Indian Ocean. We plotted the isothermal depths at 10, 12, 13, and 16°C on a spatial overlay map using data collected on monthly basis from Argo buoys and monthly CPUE (catch per unit effort) from bigeye tuna long-lines. In addition, the differences in depth between the 12 and 13°C isolines at the lower boundary of the thermocline were computed to determine the relationship between bigeye tuna vertical distribution and thermocline depth. Our analysis suggested that the vertical range of optimal temperatures (10 and 16°C) in the area of high CPUE was between 150 and 400 m, and was beneath the lower boundary depth of the thermocline. The overlay maps suggest that CPUE is highest in areas where the 12°C isothermal depth is shallower than 350 m (mode:225−350 m). Conversely, if the depth is>300 m, the CPUE tends to be low. Similarly, the highest CPUEs were observed in areas where the 13°C isothermal depth was shallower than 300 m (mode:190−275 m), whereas CPUE was low when the depth exceeded 400 m. The vertical distribution of high hook rates was concentrated in the area to the north of 15°S. We used a frequency analysis and the empirical cumulative distribution function to compute the optimum range of subsurface factors. The optimum ranges for the12 and 13°C isothermal depths were between 250−340 m and 190−270 m, respectively. The optimum depth difference ranges were 30–130 m for the 12°C isothermal depth and 0–70 m for the13°C isothermal depth. We documented the distribution interval and vertical depth range for the central fishing ground of bigeye tuna. Our results provide a reference for improving the efficiency of thelong-line fleet and aiding in resource management.关键词
大眼金枪鱼/次表层环境/热带印度洋/ArgoKey words
Thunnus obesus/subsurface environment/the Indian Ocean/Argo分类
农业科技引用本文复制引用
陈雪忠,杨胜龙,张禹,樊伟,伍玉梅..热带印度洋大眼金枪鱼垂直分布空间分析[J].中国水产科学,2013,(3):660-671,12.基金项目
国家科技支撑计划项目(2013BAD13B01) （2013BAD13B01）
资源与环境信息系统国家重点实验室开放基金(2010KF0005SA).中国水产科学研究院基本科研业务费资助(2012A1201,2013A0201) （2010KF0005SA）
中央级公益性科研院所基本科研业务费专项基金项目(2012T07) （2012T07）
上海科教创新行动计划(12231203901) （12231203901）
南海海外捕捞技术与新资源开发(2013BADBB06) （2013BADBB06）
