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Behavior of skipjack (Katsuwonus pelamis), yellowfin (Thunnus albacares), and bigeye (T. obsesus) tunas associated with drifting fish aggregating devices (dFADs) in the Indian Ocean, assessed through acoustic telemetry
Fisheries Oceanography ( IF 1.9 ) Pub Date : 2021-03-26 , DOI: 10.1111/fog.12536
Rodney Govinden 1 , Manuela Capello 2 , Fabien Forget 2 , John D. Filmalter 3 , Laurent Dagorn 2
Affiliation  

We investigated the associative behavior of skipjack (Katsuwonus pelamis), yellowfin (Thunnus albacares), and bigeye (T. obsesus) tuna within multi-species aggregations associated with drifting fish aggregating devices (dFADs) in two different regions of the western Indian Ocean: the Mozambique Channel and the Seychelles, using acoustic telemetry. We documented the residence and absence times of tunas at two temporal scales (coarse and fine scale) and made comparisons between regions. A total of 56 tunas were tagged and released at 7 different dFADs (4 in the Mozambique Channel and 3 in the Seychelles) during four research cruises. We recorded the first observations of skipjack tuna making excursions of more than 24 hours away from dFADs before returning and confirmed findings of other studies showing that yellowfin tuna can make long excursions (4.07 days) before returning to their home dFADs. Combining both studied regions, average residence times were 7.59 days (min 0.03; max 16.49), 6.64 days (min 0.01; max 26.72), and 4.58 days (min 0.09; max 18.33) for bigeye, yellowfin, and skipjack tuna, respectively. Exponential models best fitted the residence times for all three tuna species, indicating time-independent probabilities of departure from dFADs. For yellowfin tuna, at a coarse temporal scale, no regional differences were observed in the residence times. However, at a fine temporal scale, regional differences were apparent in both residence and absence times. This study provides new information on the associative behavior of tunas at dFADs in the Indian Ocean which is key to improving the science-based management of dFADs.

中文翻译:

通过声学遥测评估与印度洋漂流鱼类聚集装置 (dFAD) 相关的鲣鱼 (Katsuwonus pelamis)、黄鳍金枪鱼 (Thunnus albacares) 和大眼 (T. obsesus) 金枪鱼的行为

我们研究了鲣鱼 ( Katsuwonus pelamis )、黄鳍金枪鱼( Thunnus albacares ) 和大眼( T. obsesus )的联想行为) 与印度洋西部两个不同区域的漂流鱼聚集装置 (dFAD) 相关的多物种聚集中的金枪鱼:莫桑比克海峡和塞舌尔,使用声学遥测。我们在两个时间尺度(粗尺度和细尺度)记录了金枪鱼的栖息和消失时间,并在区域之间进行了比较。在四次研究巡航期间,共有 56 条金枪鱼被标记并在 7 个不同的 dFAD(莫桑比克海峡 4 个,塞舌尔 3 个)中释放。我们记录了鲣鱼在返回之前离开 dFAD 超过 24 小时的第一次观察结果,并证实了其他研究的结果,表明黄鳍金枪鱼可以在返回家园 dFAD 之前进行长时间的旅行(4.07 天)。结合两个研究区域,平均停留时间为 7.59 天(分钟 0. 03; 最大 16.49)、6.64 天(最小 0.01;最大 26.72)和 4.58 天(最小 0.09;最大 18.33)分别用于大眼、黄鳍和鲣鱼。指数模型最适合所有三种金枪鱼物种的停留时间,表明脱离 dFAD 的概率与时间无关。对于黄鳍金枪鱼,在粗略的时间尺度上,在停留时间上没有观察到区域差异。然而,在良好的时间尺度上,居住和缺勤时间的区域差异很明显。这项研究提供了有关印度洋 dFAD 中金枪鱼结合行为的新信息,这是改进 dFAD 科学管理的关键。指数模型最适合所有三种金枪鱼物种的停留时间,表明脱离 dFAD 的概率与时间无关。对于黄鳍金枪鱼,在粗略的时间尺度上,在停留时间上没有观察到区域差异。然而,在良好的时间尺度上,居住和缺勤时间的区域差异很明显。这项研究提供了有关印度洋 dFAD 中金枪鱼结合行为的新信息,这是改进 dFAD 科学管理的关键。指数模型最适合所有三种金枪鱼物种的停留时间,表明脱离 dFAD 的概率与时间无关。对于黄鳍金枪鱼,在粗略的时间尺度上,在停留时间上没有观察到区域差异。然而,在良好的时间尺度上,居住和缺勤时间的区域差异很明显。这项研究提供了有关印度洋 dFAD 中金枪鱼结合行为的新信息,这是改进 dFAD 科学管理的关键。
更新日期:2021-03-26
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