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首页> 外文期刊>Journal of Shellfish Research >REDUCING DISCARDS OF FLATFISH IN THE SEA SCALLOP DREDGE FISHERY BY DREDGE PAUSE
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REDUCING DISCARDS OF FLATFISH IN THE SEA SCALLOP DREDGE FISHERY BY DREDGE PAUSE

机译:通过Dreded暂停减少海扇贝疏浚渔业的粪便丢弃

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摘要

Flatfishes are routine bycatch in the Atlantic sea scallop Placopecten magellanicus (Gmelin) dredge fishery but must be discarded at sea. Despite release, a 90% mortality rate is assumed for overfished species such as yellowtail flounder Limanda ferruginae and windowpane Scophthalmus aquosus. When the scallop fishery exceeds the annual catch limit for yellowtail flounder, accountability measures may be triggered and seasonal closures of the scallop fishery can occur in specific areas. Flatfish bycatch is potentially reduced by stopping the scallop dredge in midwater to allow escape. This technique has been voluntarily practiced, but not widely adopted, owing to a lack of knowledge about its efficacy relative to collateral scallop loss. In a test of 122 scallop dredge tows on a commercial vessel using otherwise standard procedures, pausing the dredge during retrieval significantly reduced flatfish bycatch relative to pause length (0, 5, 10, or 15 min) but also allowed some scallop escapement. Flatfish were more likely to escape from paused dredges if there were fewer scallops in the dredge. Video provided evidence that flatfish do escape through the tickler chains and over the lip during pauses, and also showed the benefit of time in allowing them to work free of the suspended scallop load. During rough weather, vessel heave winnowed the dredge contents, increasing scallop loss. Captains can judge the practice as a cost-benefit calculation to avoid loss of revenue from early closure, but it appears to offer only a weak return on the time investment. Escaped fish may still suffer mortality.
机译:扁豆是在大西洋海扇贝Placepecten Magellanicus(Gmelin)疏浚渔业的常规Bycatch,但必须在海上丢弃。尽管释放,假设90%的死亡率用于覆盖物种,如淡黄珠比林达Ferruginae和WindowPane scophthalmus aposus。当扇贝渔业超过Yellowtail Goderer的年度捕获限制时,可能会触发问责制措施,并且在特定地区可能会出现扇贝渔业的季节性封闭。通过停止跨垫片在跨水中允许逃生,潜水台兼捕可能降低。由于缺乏关于抵押扇贝损失的疗效缺乏知识,这种技术已经自愿实践,但没有被广泛采用。在使用其他标准程序的商业船舶上的122个扇贝疏浚梭中的测试中,在检索期间暂停疏浚,相对于暂停长度(0,5,10或15分钟)显着减少了扁平鱼兼捕,但也允许一些扇贝擒纵。如果疏浚中有更少的扇贝,扁平鱼更有可能逃离暂停的疏浚。视频提供了证据表明,猪鱼确实在暂停期间逃离了棘手链和唇部的嘴唇,并且还允许他们没有悬浮的扇贝负荷工作的利益。在天气艰难时,船舶升起挖泥船,增加了扇贝损失。船长可以判断练习作为成本效益计算,以避免早期关闭收入的损失,但似乎只提供了较弱的时间投资回报。逃脱的鱼可能仍然遭受死亡率。

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