Yellowfin tuna (Thunnus albacares) aggregations along the shelf break off south-eastern Australia: links between inshore and offshore processes
Yellowfin tuna (Thunnus albacares) aggregations along the shelf break off south-eastern Australia: links between inshore and offshore processes
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黄鳍金枪鱼（Thunnus albacares）沿着澳大利亚东南部陆架聚集：近海和近海过程之间的联系
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
H. Galea
中科院分区：
文献类型：
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作者：
J. Young;R. Bradford;T. Lamb;L. Clementson;Rudy J. Kloser;H. Galea
1996年5月，对澳大利亚新南威尔士州南部延绳钓主要黄鳍金枪鱼捕捞水域的生物海洋学进行了与渔业捕捞量有关的审查。在伊甸正东有一个温核涡，深度250 m，温度为15℃。在这个漩涡的西部边缘，记录到相对高水平的荧光（叶绿素a）以及典型的硅藻色素，这是上升流群落的一个特征。在涡旋西部边缘，浮游动物和微浮游生物的生物量也显著较高。同样，声学数据显示涡旋边缘的后向散射浓度相对较高，特别是在陆架断裂和斜坡处。这些区域具有最大的潜在猎物生物量；同时捕获的黄鳍金枪鱼胃中存在与架子和斜坡相关的猎物物种，这一事实得到了支持。黄鳍金枪鱼（Thunnus albacares）捕获量的渔业数据显示，沿大陆架和大陆架断裂处的单位努力捕获量最高。对1988年至1998年澳大利亚东南部黄鳍金枪鱼捕捞记录的检查显示，1996年的捕捞量最高，约75%的捕捞量来自涡流的西部边缘。我们的结论是，此时该地区存在暖核涡，为黄鳍鱼被吸引提供了一个局部但富有生产力的区域。
In May 1996 the biological oceanography of the main yellowfin tuna longline fishing waters off southern New South Wales, Australia, was examined in relation to the catch by the fishery. A warm-core eddy was identified directly east of Eden with a temperature at 250 m depth of 15˚C. At the western edge of this eddy, relatively high levels of fluorescence (chlorophyll a) were recorded together with pigments typical of diatoms, a feature of upwelling communities. The biomass of zooplankton and micronekton was also significantly higher at the western edge of the eddy. Similarly, acoustic data showed relatively high concentrations of backscatter at the margins of the eddy, particularly at the shelf break and slope. These areas had the greatest potential prey biomass; a fact supported by the presence of shelf-and slope-associated prey species in the stomachs of yellowfin tuna caught at the same time. Fishery data for yellowfin tuna (Thunnus albacares) captures showed that catch per unit effort was highest along the shelf and shelf break. Examination of yellowfin tuna catch records from 1988 to 1998 from south-eastern Australia showed highest catches in 1996, ~75%of the catch coming from the western edge of the eddy. We conclude that the presence of a warm-core eddy in the area at this time provided a localized but productive area to which the yellowfin were attracted.