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Bioeconomic advice on TAC - the state of the art in the Norwegian fisherymanagement

机译：TAC的生物经济建议-挪威渔业管理的最新水平

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The total allowable catch (TAC) is a key instrument in the management of several important fish stocks in the Barents and the Norwegian Seas, and advice on TAC levels used to be based purely on biological information and guidelines from the International Council for the Exploration of the Seas (ICES). In 1991, ICES Advisory Committee on Fisheries Management (ACFM) stated that its objective was to provide the advice necessary to maintain viable fisheries within sustainable ecosystems, leaving the actual choice of management strategy and corresponding TAC for stocks within safe biological limits to managers. In arriving at such a choice, managers should ideally state their objectives in exploiting their fish resource, and analyse the relevant consequences of different levels of TAC. Norway is one of the major 'share-holders' in the fish stocks in the Barents and Norwegian Seas and the country's fishery policy reflects several national objectives, as well as international commitments. In the light of these objectives, the 'state of the art' advice on management strategy and corresponding TAC levels given by experts in the Norwegian fishery management is described. Two transboundary stocks, northeast Arctic cod (Gadus morhua) and Norwegian spring spawning herring (Clupea harengus), serve as examples. The advice is built on analyses of biological and economic consequences, and prognoses for 5 and 10 years are used for cod and herring respectively. In the analysis of the cod fishery, we will show how the optimal management strategy or harvest control rule will change when calculating private economic yield rather than social economic yield. Uncertainty attached to the recruitment model of the Norwegian spring spawning herring and the inclusion of such uncertainty in the advice is dealt with explicitly. The objective of this paper is to illustrate some means of applying existing biological and economic knowledge in practical advice on the choice of TAC.
机译：总允许捕捞量（TAC）是管理巴伦支和挪威海中几种重要鱼类种群的关键工具，过去有关TAC水平的建议纯粹是基于国际生物勘探理事会的生物信息和指南。海洋（ICES）。 1991年，ICES渔业管理咨询委员会（ACFM）表示，其目标是提供必要的建议，以在可持续的生态系统内维持可行的渔业，而管理者的实际选择方法和相应的TAC则留给管理者。在做出这种选择时，管理人员应理想地阐明其开发鱼类资源的目标，并分析不同水平的TAC的相关后果。挪威是巴伦支海和挪威海鱼类种群的主要“股东”之一，该国的渔业政策反映了若干国家目标和国际承诺。根据这些目标，描述了挪威渔业管理专家给出的有关管理策略和相应TAC水平的“最新技术”建议。有两个跨界种群，例如东北鳕鱼（Gadus morhua）和挪威春季产卵鲱鱼（Clupea harengus）。该建议以对生物学和经济后果的分析为基础，并且对鳕鱼和鲱鱼分别使用5年和10年的预后。在对鳕鱼渔业的分析中，我们将说明在计算私人经济收益而不是社会经济收益时，最佳管理策略或收获控制规则将如何变化。挪威春季产卵鲱鱼的招募模式存在不确定性，并且在建议中包括了此类不确定性。本文的目的是说明在选择TAC的实践建议中运用现有生物学和经济知识的一些方法。

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