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首页> 外文期刊>Fisheries Science >Spatial and temporal variation in the distribution of juvenile southern bluefin tuna Thunnus maccoyii: implication for precise estimation of recruitment abundance indices
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Spatial and temporal variation in the distribution of juvenile southern bluefin tuna Thunnus maccoyii: implication for precise estimation of recruitment abundance indices

机译：南方蓝鳍金枪鱼少年金枪鱼分布的时空变化：对精确估计招聘丰度指数的意义

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摘要

Acoustic tags were used to examine the spatial and temporal distribution of southern bluefin tuna (SBT) in southern Western Australia, which is in a region where fishery-independent acoustic surveys of the recruitment abundance index of SBT have been historically undertaken. We investigated patterns of SBT distribution within and inshore of the acoustic survey area during three summer seasons. Annual differences in distribution patterns were characterized by two distinctive migration pathways. An inshore-migrating pathway was observed in two seasons (2004/2005 and 2006/2007), with a relatively high proportion of tagged SBT (84.5, 65.0%) migrating inshore of the acoustic survey area. The other pathway was concentrated along the shelf (2005/2006 season), with an estimated 63.3% of tagged SBT moving within the survey area. These variable migration patterns may bias the interannual fluctuations in abundance indices. Current survey methods can be modified to include both inshore and continental shelf areas. This contribution shows that the accuracy of acoustic surveys can be improved by including ecological patterns.
机译：声学标签用于检查西澳大利亚南部南部的蓝鳍金枪鱼（SBT）的时空分布，该地区在历史上一直进行与渔业无关的SBT招聘丰度指数的声学调查。我们调查了三个夏季在声学调查区域内外的SBT分布模式。分布模式的年度差异以两种独特的迁移途径为特征。在两个季节（2004/2005和2006/2007）中观察到了一条近岸迁移途径，其中相对较高比例的带标签SBT（84.5，65.0％）迁移到声学调查区域的近岸。另一个途径集中在货架上（2005/2006季节），估计有63.3％的带标签SBT在调查区域内移动。这些可变的迁移模式可能会使丰度指数的年际波动产生偏差。可以修改当前的调查方法以包括近岸和大陆架区域。这一贡献表明，通过纳入生态模式可以提高声学勘测的准确性。

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