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首页> 外文期刊>ICES Journal of Marine Science >Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod (Gadus morhua)
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Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod (Gadus morhua)

机译：用于盆栽鱼保留装置的开发和测试：透明触发器显着提高大西洋鳕鱼（Gadus Morhua）的升高效率

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摘要

Fish pots have lower catch efficiency than gillnets and trawls and, therefore, are rarely used for catching Atlantic cod (Gadus morhua) and similar species. Fish-retention devices (FRDs), non-return devices that permit fish to enter the pot while impeding exit, reduce the pot exit rate and therefore can increase catches. Conventional FRDs, however, also reduce entry rate and may not improve catches. To increase pot-catch efficiency, we developed and tested a new trigger-type FRD, made of transparent acrylic glass, which we named acrylic fingers (AFs). AFs are almost invisible underwater and offer little resistance to entering cod. We compared AFs with Neptune fingers (NFs), a conventional trigger-type FRD with a distinct visual outline, by observing cod entry and exit rates through both trigger types rigged to a pot in a net pen. Both trigger types significantly reduced exit rates compared with a funnel without triggers; however, NFs also reduced entry rates by visually deterring cod. Specifically, AFs have higher entry-to-exit ratios and therefore improve catch efficiency. Combining AFs with funnels further increased catch efficiency. Thus, transparent acrylic triggers present a promising new approach to increasing pot-catch efficiency and may increase the uptake of the cod pot, an environmentally low-impact gear.
机译：鱼盆的效率低于GILLNET和拖网，因此很少用于捕获大西洋鳕鱼（GADUS MORHUA）和类似物种。鱼类保留装置（FRD），允许鱼进入锅的不返回装置在阻碍出口时，降低罐出口率，因此可以增加捕获量。然而，传统的FRD也降低了进入率，并且可能不会改善捕获。为了提高罐效率，我们开发并测试了一种由透明丙烯酸玻璃制成的新型触发器型FRD，我们将亚克力手指（AFS）命名。 AFS几乎看不见的水下，并对进入鳕鱼提供很小的抵抗力。我们将AFS与海王星手指（NFS）进行比较，传统的触发器型FRD具有不同的视觉轮廓，通过观察COD进入和退出速率，所述触发器类型被操纵到网笔中的锅中。与没有触发的漏斗相比，两种触发类型明显减少了退出率;然而，NFS也通过视觉抑制鳕鱼减少进入率。具体地，AFS具有更高的进出出口比，因此提高了升高效率。将AFS与Funnels相结合进一步提高了升高的效率。因此，透明的丙烯酸曲线触发器提出了增加的新方法来提高罐捕获效率，并且可以增加COD锅的摄取，环境低冲击齿轮。

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