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首页> 外文期刊>ICES Journal of Marine Science >Partial fishing mortality per fishing trip: a useful indicator of effective fishing effort in mixed demersal fisheries
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Partial fishing mortality per fishing trip: a useful indicator of effective fishing effort in mixed demersal fisheries

机译：每次捕鱼行程的部分捕捞死亡率：在混合水下渔业中有效捕捞努力的有用指标

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摘要

Effort management has been proposed as an alternative for quota management in mixed demersal fisheries. It requires a metric to estimate the fishing mortality imposed by a given quantity of nominal fishing effort. Here, we estimate the partial fishing mortality rate imposed by one unit of fishing effort (F_(pue)) during individual fishing trips and explore the usefulness of this indicator for managing North Sea beam trawlers > 300 hp targeting sole (Solea solea) and plaice (Pleuronectes platessa). F_(pue), is positively related to vessel engine power, and increased annually by 2.8% (sole) and 1.6% (plaice). The positive trend was due to an increase in skipper skills and investment in auxiliary equipment, the replacement of old vessels by new ones and, to a lesser extent, to upgrade engines. The average F_(pue) imposed per day at sea by a 2000 hp beam trawler was estimated to be 1.0 x 10~(-5) (sole) and 0.6 x 10~(-5) (plaice), and it showed substantial seasonal and spatial variations. The F_(pue) of sole and plaice were negatively related in summer and showed no relationship in winter. The existence of predictive seasonal and spatial patterns in F_(pue) opens up the possibility of fine-tuning management by directed effort restrictions and uncoupling management of plaice and sole.
机译：有人提议将努力管理作为混合式深海渔业配额管理的替代方法。它需要一个度量来估算由给定数量的名义捕捞努力所造成的捕捞死亡率。在这里，我们估算了单个钓鱼行程中一个单位捕捞努力所致的部分捕捞死亡率（F_（pue）），并探索了该指标对管理大于300 hp的目标海底（Solea solea）和鱼的北海拖网渔船的有用性（P侧目plates属）。 F_（pue）与船舶发动机功率成正相关，并且每年增加2.8％（唯一）和1.6％（地方）。积极的趋势是由于船长技能的提高和对辅助设备的投资，新船替换了旧船以及较小程度地升级了发动机。 2000马力的拖网渔船每天在海上施加的平均F_（pue）估计为1.0 x 10〜（-5）（唯一）和0.6 x 10〜（-5）（地点），并且显示出明显的季节性和空间变化。鞋底和的F_（pue）在夏季呈负相关，而在冬季则无相关性。 F_（pue）中预测性的季节性和空间模式的存在为通过定向努力限制以及and和鞋底的解耦管理打开了微调管理的可能性。

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