Optimal Age- and Gear-specific Harvesting Policies for North-East Arctic Cod
AbstractWe examine optimal harvest policies in a multi-cohort, multi-gear bioeconomic model of North-East Arctic cod (Gadus morhua) which includes cannibalism and contains broader ecosystem effects. By controlling the selectivity of the different Fishing equipment, we can partially target different age cohorts. We show that cur- rent gear selectivity implies that the wrong Fish are targeted. Optimization shifts the exploitation pattern towards older and heavier Fish. This increases the harvested biomass while reducing the number of Fish removed from the ocean. The result is a much more robust and abundant cod stock with an age/size distribution closer to the stocks natural state. We optimize the Net Present Value (NPV) generated by the Fishery by letting effort and selectivity be the control variables and and that NPV may be more than doubled, even when only gear selectivity or harvest effort is allowed to vary.
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Bibliographic InfoPaper provided by Oslo University, Department of Economics in its series Memorandum with number 16/2008.
Length: 38 pages
Date of creation: 01 Jul 2008
Date of revision:
Contact details of provider:
Postal: Department of Economics, University of Oslo, P.O Box 1095 Blindern, N-0317 Oslo, Norway
Phone: 22 85 51 27
Fax: 22 85 50 35
Web page: http://www.oekonomi.uio.no/indexe.html
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Bioeconomics; North-East Arctic cod: Age-structure; Gear selectivity; Optimal harvest policies;
Find related papers by JEL classification:
- A10 - General Economics and Teaching - - General Economics - - - General
This paper has been announced in the following NEP Reports:
- NEP-ALL-2009-01-31 (All new papers)
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