A Bioeconomic Model of Partial Closures and Habitat Effects - The Case of a Migratory Fish Species Public Deposited

http://ir.library.oregonstate.edu/concern/conference_proceedings_or_journals/x059c8449

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  • A bioeconomic model allowing different degrees of harvesting closures for two sub-stocks consisting of mature and immature fish is presented. Hence the model opens for partial closures of fisheries on both sub-stocks. Migration between the two sub-stocks is defined as recruitment of the young to the mature sub-stock, and egg production in the mature entering the young sub-stock. Hence density dependent migration is a life-cycle movement rather than a physical one. Assuming economically optimal management in the harvestable areas, it is never optimal to implement reserves. If, however, there is to be made a choice of reserve implementation between sub-stocks with equal economic and biological parameters, it is better to close the fishery upon the young sub-stock. The model is expanded to include positive habitat effects dependent on the magnitude of closure and the sub-stock’s relevant habitat. In this case reserve implementation may be economically optimal. It is shown that there is an inverse relationship between size of potential for habitat improvement and optimal reserve size. The North East Atlantic cod stock is used as an applied example.
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  • Armstrong, Claire W., Richard J. Armstrong, Siv Reithe. 2004. A Bioeconomic Model of Partial Closures and Habitat Effects - The Case of a Migratory Fish Species. Peer Review: No. In: Proceedings of the Twelfth Biennial Conference of the International Institute of Fisheries Economics & Trade, July 20-30, 2004, Tokyo, Japan: What are Responsible Fisheries? Compiled by Ann L. Shriver. International Institute of Fisheries Economics & Trade, Corvallis, Oregon, USA, 2004. CD ROM. ISBN 0-9763432-0-7
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