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首页> 外文期刊>ICES Journal of Marine Science >The contribution of quota to the discards problem: a case study on the complexity of common megrim Lepidorhombus whijfiagonis discarding in the northern North Sea
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The contribution of quota to the discards problem: a case study on the complexity of common megrim Lepidorhombus whijfiagonis discarding in the northern North Sea

机译：配额对丢弃物问题的贡献：以北海北部常见的普通海象Lepidorhombus whijfiagonis丢弃的复杂性为例

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摘要

The common megrim Lepidorhombus whijfiagonis is a commercially important, high-value flatfish species. From the early 2000s, discarding of common megrim in the northern North Sea has been widespread. In this study, we investigated temporal variation in megrim discarding in the mixed demersal fishery in the northern North Sea before, and following recent quota increases. Furthermore, logistic regression models were applied to investigate the effects of a range of explanatory factors on the probability of individual fish being discarded. Results indicate that discardingon the vessels sampled has declined from an average of 54% of the total common megrim catch in 2009 to 20% in 2012. The decrease in total discards was primarily a result of a decrease in the proportions of discards categorized by the crew as small within the catches from 0.39 ( ± 0.02 s.e.) in 2009 to 0.10 ( ± 0.01 s.e.) in 2012. Model outputs also suggest that the likelihood of a fish being discarded decreases significantly (p < 0.001) with increasing quota. The current megrim total allowable catch serves only to regulate landings and does little to regulate fishing mortality. Additionally, the proposed reform of the CFP, including the move towards a discards ban and the implementation of maximum sustainable yield, raises a number of concerns that need to be addressed if the northern North Sea mixed demersal fishery is to be managed sustainably and remain economically viable in the future.
机译：常见的猫科鳞翅目鳞翅目鱼类是商业上重要的高价值比目鱼物种。从2000年代初开始，北海北部常见的海藻被丢弃。在这项研究中，我们调查了北配额海北部之前和之后近期配额增加之后混合海底渔业中丢弃海藻的时间变化。此外，使用逻辑回归模型研究了一系列解释性因素对个别鱼类被丢弃的可能性的影响。结果表明，采样船上的丢弃物已从2009年的平均总海藻捕获量的平均54％下降到2012年的20％。丢弃物总量的减少主要是由于船员分类的丢弃物比例下降的结果捕捞量从2009年的0.39（±0.02 se）到2012年的0.10（±0.01 se）很小。模型输出还表明，随着配额的增加，丢弃鱼的可能性显着降低（p <0.001）。当前的总允许捕捞量仅用于调节着陆，对调节捕鱼死亡率几乎没有作用。此外，CFP的拟议改革，包括走向丢弃物禁令和实施最大的可持续产量，引起了许多问题，如果要对北海北部混合沉没式渔业进行可持续管理并保持经济效益，就必须解决这些问题。将来可行。

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