Environmental preferences of yellowfin tuna (Thunnus albacares) at the northern extent of its range
Environmental preferences of yellowfin tuna (Thunnus albacares) at the northern extent of its range
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DOI：
10.1007/s002270050231
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发表时间：
1997-11-01
期刊：
影响因子：
2.4
通讯作者：
Farwell, C
中科院分区：
文献类型：
--
作者：
Block, BA;Keen, JE;Farwell, C
我们使用声学遥测检查小规模的运动模式的黄鳍金枪鱼（Thunnus albacares）在加州湾的北方范围内的范围。利用温度、氧气、海流和荧光测定法等海洋学剖面图来确定运动与环境特征之间的关系。3条黄鳍金枪鱼（8 ~ 16 kg）跟踪2 ~ 3 d。这三条鱼大部分时间都在温跃层（深度18至45 m）上方，水温> 17.5摄氏度。在加州湾，黄鳍金枪鱼由于受温度的限制，垂直分布有限。这三条鱼定期在温跃层（60至80米）以下进行短暂潜水，遇到较低的温度（> 11摄氏度）。当在北方纬度游泳时，混合层的深度在很大程度上决定了黄鳍金枪鱼在水柱中的空间分布。黄鳍金枪鱼喜欢把大部分时间花在温跃层的顶部。氧剖面表明，金枪鱼遇到的海洋水体，最经常从6.8至8.6毫克O-2升（-1），表明没有限制，由于氧浓度。黄鳍金枪鱼以0.46至0.90 m s（-1）（0.9至1.8节h（-1））的速度旅行，并经常表现出振荡潜水模式，以前认为这是游泳过程中保存能量的可能策略。
We used acoustic telemetry to examine the small-scale movement patterns of yellowfin tuna (Thunnus albacares) in the California Bight at the northern extent of their range. Oceanographic profiles of temperature, oxygen, currents and fluorometry were used to determine the relationship between movements and environmental features. Three yellowfin tuna (8 to 16 kg) were tracked for 2 to 3 d. All three fish spent the majority of their time above the thermocline (18 to 45 m in depth) in water temperatures > 17.5 degrees C. In the California Bight, yellowfin tuna have a limited vertical distribution due to the restriction imposed by temperature. The three fish made periodic short dives below the thermocline (60 to 80 m), encountering cooler temperatures (> 11 degrees C). When swimming in northern latitudes, the depth of the mixed layer largely defines the spatial distribution of yellowfin tuna within the water column. Yellowfin prefer to spend most of their time just above the top of the thermocline. Oxygen profiles indicated that the tunas encountered oceanic water masses that ranged most often from 6.8 to 8.6 mg O-2 l(-1), indicating no limitation due to oxygen concentrations. The yellowfin tuna traveled at speeds ranging from 0.46 to 0.90 m s(-1) (0.9 to 1.8 knots h(-1)) and frequently exhibited an oscillatory diving pattern previously suggested to be a possible strategy for conserving energy during swimming.