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Appreciating the value of age: An evaluation of efficiency gains from controlling gear selectivity under various scenarios Public Deposited

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  • The central objective of fishery management is to ensure the sustainability and profitability of the resource base. The importance of the fish stock's age-structure is increasingly recognized in economics and ecology. Still, current policies predominately rely on the aggregate biomass. We carefully calibrate a detailed model on the North-East Arctic cod fishery to estimate the efficiency gains from controlling gear selectivity. Moreover, we explore the sensitivity of optimal harvesting policies with respect to different assumptions on the biological model, in particular different recruitment functions and density-dependent growth. Age-selective harvesting is central to increasing profits in all scenarios. However, the maximum achievable Net-Present-Value differs strongly for the different biological assumptions, which -- by and large -- all are equally defendable. This points to the need to more routinely assess the structural uncertainty surrounding bio-economic simulations. Our study provides an increased understanding of the determinants of age-structured harvesting, emphasizing that it is high time to move beyond traditional reference points and consider age-differentiated management tools.
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  • Diekert, F. Appreciating the value of age: An evaluation of efficiency gains from controlling gear selectivity under various scenarios. In: Visible Possibilities: The Economics of Sustainable Fisheries, Aquaculture and Seafood Trade: Proceedings of the Sixteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, July 16-20, Dar es Salaam, Tanzania. Edited by Ann L. Shriver. International Institute of Fisheries Economics and Trade (IIFET), Corvallis, 2012.
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  • AQUAFISH, USAID, NEPAD Planning and Coordination Agency, Norad, The World Bank, Hyatt Regency Dar es Salaam, NAAFE, World Wildlife Fund, United Nations University Fisheries Training Programme, ICEIDA, JICA, JIFRS, The European Association of Fisheries Economists, International Seafood Sustainability Foundation
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  • description.provenance : Made available in DSpace on 2013-10-31T21:54:26Z (GMT). No. of bitstreams: 1 Diekert-94.pdf: 6279 bytes, checksum: 4ad58dfb823a8fe45af5bf3063ac6458 (MD5) Previous issue date: 2012
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  • description.provenance : Approved for entry into archive by Janet Webster(janet.webster@oregonstate.edu) on 2013-10-31T21:54:26Z (GMT) No. of bitstreams: 1 Diekert-94.pdf: 6279 bytes, checksum: 4ad58dfb823a8fe45af5bf3063ac6458 (MD5)

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