Journal Article

Harvest control rules for stocks displaying dynamic production regimes

R. K. Mohn and G. A. Chouinard

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 64, issue 4, pages 693-697
Published in print May 2007 | ISSN: 1054-3139
Published online May 2007 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1093/icesjms/fsm042
Harvest control rules for stocks displaying dynamic production regimes

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Mohn, R. K., and Chouinard, G. A. 2007. Harvest control rules for stocks displaying dynamic production regimes. – ICES Journal of Marine Science, 64: 693–697.

Several cod and haddock stocks in Atlantic Canada have undergone substantial changes in productivity. Regimes are defined as periods of relatively stable production separated by rapid transitions to a different level. These regimes are deconstructed into their dominant determinants of growth, survivorship, or recruitment. Using southern Gulf of St Lawrence cod and eastern Scotian Shelf haddock as case studies, regimes are identified based on production. Haddock display an almost threefold difference between productive and non-productive regimes, owing mainly to a change in reproductive output. Cod have a more complicated history, displaying three regimes, and a variation in production by a factor of approximately eight. The production data in each regime are identified and smoothed to show the underlying dependence on biomass. Finally, simple three-phase harvest control rules (having critical, cautious, and healthy zones) for distinct regimes are presented to illustrate the potential importance of regimes in resource management.

Keywords: harvest control rules; precautionary approach; productivity regimes

Journal Article.  2552 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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