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Fishing and the impact of marine reserves in a variable environment

Rodwell, L D and Roberts, C M (2004) Fishing and the impact of marine reserves in a variable environment. Canadian Journal of Fisheries and Aquatic Sciences. pp. 2053-2068. ISSN 0706-652X

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We use discrete-time models to investigate the impact of marine reserve establishment on fishery catch and biomass levels in open-access and quota-regulated fisheries under conditions of recruitment variability and natural mortality events. We find that under the conditions of variability tested, reserves can increase the probability of achieving target levels of biomass (60%, 35%, and 5% of carrying capacity) and can reduce catch variability in neighbouring fisheries, making future planning in the fishery more efficient. The size of the reserve required to meet each objective will depend on the initial condition of the stock and the exploitation rate in the fishery. Reserve coverage of between 20% and 40% prevent stock collapse in most cases. In heavily exploited fisheries, reserves are also likely to enhance mean catches, particularly in highly variable systems. If the stock has previously been heavily exploited, large reserves (greater than or equal to60%) may be required to significantly increase the probability of achieving target biomass levels. However, once stocks have recovered, reserve coverage may be reduced without a reduction in this probability of success.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2004 NRC Canada
Institution: The University of York
Academic Units: The University of York > Environment (York)
Depositing User: Sherpa Assistant
Date Deposited: 22 Mar 2005
Last Modified: 23 May 2016 00:15
Published Version: http://dx.doi.org/10.1139/F04-142
Status: Published
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/343

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