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首页> 外文期刊>Latin american journal of aquatic research >Survivorship of species caught in a longline tuna fishery in the western equatorial Atlantic Ocean
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Survivorship of species caught in a longline tuna fishery in the western equatorial Atlantic Ocean

机译：赤道西大西洋金枪鱼延绳钓捕捞的物种的生存

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ABSTRACT Longlines bearing “hook timers” (HTs) and alternating circle (15/0 and 17/0) and “J” (10/0) hooks were employed off the coast of Brazil to measure differences in fishing mortality associated with hook type and on-hook time between capture and boarding. A total of 431 HTs were activated, revealing a clear pattern of the increased mortality rate of fishes associated with increased on-hook time. Swordfish had high mortality rates, unlike blue sharks, which had low mortality rates regardless of hook type and the location in which the hook was transfixed. The six species of tunas and billfishes examined in this study showed a strong association between hooking location and the animal's release condition, with reduced mortality associated with individuals hooked externally. Results suggest that knowledge of factors affecting the survival of pelagic fishes caught in longline fisheries may enable the development and adoption of fishing methods to reduce mortality of longline bycatch.
机译：摘要在巴西沿海地区使用带有“钓钩计时器”（HTs）和交替圆圈（15/0和17/0）和“ J”（10/0）钓钩的延绳钓来测量与钓钩类型和钓钩类型有关的捕捞死亡率差异捕获和登机之间的挂机时间。总共激活了431个HT，揭示了与挂机时间增加相关的鱼类死亡率增加的清晰模式。与蓝鲨不同，箭鱼的死亡率很高，而蓝鲨的鱼死亡率却低，无论钩的类型和钩的固定位置如何。在这项研究中检查的6种金枪鱼和比目鱼显示出钩的位置与动物的释放状况之间有很强的联系，并降低了与外部钩的个体相关的死亡率。结果表明，了解影响延绳钓捕捞的远洋鱼类生存的因素可能有助于开发和采用捕捞方法以降低延绳钓兼捕的死亡率。

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