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Sustainable fishing gear: the case of modified circle hooks in a Costa Rican longline fishery

机译：可持续的渔具：哥斯达黎加延绳钓渔业中使用改进的圆形钩的情况

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摘要

Our research aims to identify longline fishing gear modifications that can improve fishing selectivity and reduce incidental capture of non-target species. Catch rates and anatomical hook locations (AHL) were compared when using a 14/0 standard "control" circle hook with a 0° offset and an experimental "appendage" hook in a Costa Rican longline fishery. With the appendage, the maximum dimension of the appendage hook was increased by 10% and the minimum dimension of the hook by 19%. A total of 1,811 marine animals were captured during five fishing trips. By taxonomic groups, sea turtles represented the largest total catch (27%), followed by sharks (26%), rays (25%), mahimahi (Coryphaena hippurus) (12%), and tunas and billfish (10%). Non-target and discard species, such as rays and sea turtles, accounted for over half of the total catch. Catch per unit effort (CPUE; number of individuals per 1,000 hooks) was higher with control hooks compared to appendage hooks for all species' categories except rays; appendage hooks caught 52% fewer sea turtles and 23% fewer tunas and billfish than standard hooks, which represents a significant reduction in bycatch of endangered and other species. No differences were found in the AHL for sea turtles, suggesting use of the appendage may not incur additional advantages regarding turtles' post-release survivorship. Despite lower catch rates for marketable species, such as sharks and mahimahi, use of the appendage resulted in dramatic reductions in catch rates of sea turtles. The results suggest that large scale adoption of hooks with a significantly wider hook dimension could be an effective conservation measure to maintain marine biodiversity while allowing for continued fishing.
机译：我们的研究旨在确定延绳钓渔具的改进方法，这些方法可以提高捕鱼的选择性并减少对非目标物种的偶然捕获。在哥斯达黎加延绳钓渔业中使用偏移为0°的14/0标准“对照”圆钩和实验性“附件”钩时，比较了捕获率和解剖钩位置（AHL）。对于附件，附件挂钩的最大尺寸增加了10％，挂钩的最小尺寸增加了19％。在五次钓鱼之旅中共捕获了1,811只海洋动物。在分类上，海龟占总捕获量的最大（27％），其次是鲨鱼（26％），rays鱼（25％）、,（Coryphaena hippurus）（12％）以及金枪鱼和比目鱼（10％）。非目标物种和丢弃物种，例如rays和海龟，占总捕获量的一半以上。使用控制钩的单位捕捞量（CPUE；每1,000个钩的个体数量）高于除射线以外的所有物种类别的附属钩；与标准的鱼钩相比，附属鱼钩捕获的海龟减少了52％，金枪鱼和bill鱼减少了23％，这表明濒危物种和其他物种的兼捕物显着减少。在海龟的AHL中没有发现差异，这表明使用附肢可能不会为海龟的释放后生存带来其他好处。尽管对诸如鲨鱼和ma鱼等可销售品种的捕捞率较低，但使用附肢却导致海龟捕捞率大大降低。结果表明，大范围采用钩子尺寸较大的钩子可能是维持海洋生物多样性同时允许继续捕鱼的有效养护措施。

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  • 来源
    《Marine biology》 |2011年第4期|p.757-767|共11页
  • 作者

    Yonat Swimmer; Jenny Suter; Randall Arauz; Keith Bigelow; Andres Lopez; lena Zanela; Alan Bolanos; Jorge Ballestero; Raul Suarez; John Wang; Christofer Boggs;

  • 作者单位

    Pacific Islands Fisheries Science Center, NOAA Fisheries,2570 Dole Street, Honolulu, HI 96822, USA;

    Fisheries Resources Division, Southwest Fisheries ScienceCenter, Ocean Associates Inc., 8604 La Jolla Shores Drive,La Jolla, CA 92037-1508, USA;

    PRETOMA and Sea Turtle Restoration Program,1203-1100 Tibas, San Jose, Costa Rica;

    Pacific Islands Fisheries Science Center, NOAA Fisheries,2570 Dole Street, Honolulu, HI 96822, USA;

    Pacific Islands Fisheries Science Center, NOAA Fisheries,2570 Dole Street, Honolulu, HI 96822, USA;

    PRETOMA and Sea Turtle Restoration Program,1203-1100 Tibas, San Jose, Costa Rica;

    PRETOMA and Sea Turtle Restoration Program,1203-1100 Tibas, San Jose, Costa Rica;

    PRETOMA and Sea Turtle Restoration Program,1203-1100 Tibas, San Jose, Costa Rica;

    PRETOMA and Sea Turtle Restoration Program,1203-1100 Tibas, San Jose, Costa Rica;

    Joint Institute for Marine and Atmospheric Research,University of Hawaii, 1000 Pope Road, Honolulu,HI 96822, USA;

    Pacific Islands Fisheries Science Center, NOAA Fisheries,2570 Dole Street, Honolulu, HI 96822, USA;

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