...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine biology >Diel behaviour of tuna and non-tuna species at drifting fish aggregating devices (DFADs) in the Western Indian Ocean, determined by fishers' echo-sounder buoys
【24h】

Diel behaviour of tuna and non-tuna species at drifting fish aggregating devices (DFADs) in the Western Indian Ocean, determined by fishers' echo-sounder buoys

机译：金枪鱼和非金枪鱼物种在西印度洋漂流鱼类聚集装置（DFAD）上的Diel行为，由渔民的回声浮标确定

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

As tropical pelagic species are attracted by floating objects in the surface of the ocean, industrial purse seiners deploy thousands of man-made drifting fish aggregating devices (DFADs) to facilitate their catch of tunas. However, the sharp increase in the use of DFADs leads to some ecological concerns, such as producing higher amount of by-catch or alteration of natural behaviour of fish. We used fishers ' satellite-linked GPS buoys equipped with echo-sounders to continuously collect acoustic samples under remote DFADs and investigate the diel behaviour patterns of the associated fish (i.e., non-tuna species and small and large tunas) and their potential biological interactions. Results showed a strong correlation between the presence of non-tuna species and small tunas, and between small and large tunas. Diel biomass dynamics were highly variable and seem to be both species and regionspecific, which may suggest adaptive behaviour patterns. Tuna associated with DFADs in the Somalia area showed a clear night-time associative behaviour. In contrast, tuna in the NW Seychelles associated with DFADs to a greater degree during daytime. In the Mozambique Channel, large tuna showed daytime associative behaviour, while small tuna showed a maximum biomassat sunrise, decreasing over the day. The associative behaviour of non-tuna species was slightly variable, being uniform near the equator or showing two peaks when increasing latitude. This study shows the importance and effect of biological factors on the associative behaviour of the fish and serves as a first step towards improving pre-set selectivity of purse seine fisheries using DFADs. The fish presence and density may improve DFAD attraction and detectability and the observed periodicity by species and area shows both similarities and differences with published literature.
机译：由于热带中上层物种被海洋表面的漂浮物吸引，工业围网捕捞者部署了数千种人造漂流鱼聚集装置（DFAD），以方便其捕捞金枪鱼。但是，DFADs的使用急剧增加导致了一些生态问题，例如产生大量的副渔获物或改变鱼类的自然行为。我们使用了配备有回声测深仪的渔民卫星GPS浮标，连续收集偏远DFAD下的声学样本，并研究了相关鱼类（即非金枪鱼物种和大小金枪鱼）的diel行为模式及其潜在的生物相互作用。结果显示，非金枪鱼种类与小金枪鱼之间以及小金枪鱼与大金枪鱼之间存在很强的相关性。 Diel生物量动态变化很大，并且似乎是物种和区域特有的，这可能表明适应性行为模式。与索马里地区DFAD有关的金枪鱼表现出明显的夜间联想行为。相比之下，塞舌尔西北部的金枪鱼白天白天与DFAD的关联程度更高。在莫桑比克海峡，大金枪鱼表现出白天的联想行为，而小金枪鱼表现出最大的生物量，在日出时减少。非金枪鱼物种的关联行为略有变化，在赤道附近是均匀的，或者在增加纬度时显示两个峰值。这项研究表明了生物学因素对鱼类的关联行为的重要性和影响，是迈向使用DFAD改善围网渔业预设选择性的第一步。鱼的存在和密度可能会改善DFAD的吸引力和可检测性，并且按物种和地区观察到的周期性显示与已发表文献的异同。

著录项

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号