Abstract

With the introduction of the Landing Obligation (LO) in EU fisheries, there is an increasing need for fishers to avoid unwanted catches while maximizing revenues. Improving understanding of the spatio-temporal dynamics of unwanted catches could assist the fishing industry optimize catches by altering where they fish. How following such advice relates to revenues and fishery dynamics requires more consideration. We take an existing hotspot mapping methodology and examine how it could be used to identify fishing opportunities under the LO in Irish (Celtic Sea) and Danish (North Sea and Skagerrak) demersal fisheries. We consider if fishing effort can be relocated to avoid unwanted catches while maintaining revenues. The value per unit effort of fishing activity in both areas was often linked to high catch rates of key demersal species (cod, haddock, hake, and whiting). Our analyses indicated, however, that there are options to fish in areas that could provide higher revenues while avoiding below minimum conservation reference size catches and choke species. This was evident across both case study areas demonstrating that hotspot mapping tools could have wide applicability. There does, however, remain a need to explore how the displacement of vessels may further alter species distributions and fleet economics.

中文翻译：

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钓鱼欧元：测绘应用程序如何在着陆义务下协助维持收入

摘要

随着欧盟渔业中的着陆义务（LO）的引入，越来越多的渔民需要避免不必要的捕捞而使收入最大化。增进对多余渔获物时空动态的了解，可以通过改变捕捞地点来帮助捕捞业优化渔获物。遵循这样的建议如何与收入和渔业动态相关需要更多的考虑。我们采用现有的热点制图方法，并研究如何将其用于在爱尔兰（凯尔特海）和丹麦（北海和Skagerrak）深海渔业中的LO下确定捕鱼机会。我们考虑是否可以将捕捞工作转移到保持收入的同时避免不必要的捕获。在这两个地区，捕捞活动每单位工作量的价值通常与关键的沉水物种（鳕鱼，黑线鳕，鳕鱼和鳕鱼）。然而，我们的分析表明，在可以提供更高收入同时又避免低于最低保护参考尺寸的渔获物和ke鱼物种的地区，可以选择捕鱼。这在两个案例研究领域都很明显，这表明热点映射工具可能具有广泛的适用性。但是，仍然有必要探索船只的移位如何进一步改变物种分布和船队经济的问题。