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Autor  |
McGarvey, R. |
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Titel |
An age-structured open-access fishery model |
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Zeitschrift, Artikel |
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Jahr |
1994 |
Publikation |
Can. J. Fish. Aquat. Sci |
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51 |
Ausgabe |
4 |
Seiten |
900-912 |
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Schlüsselwörter |
fischerei, Population, Mathematik, Modell, Statistik, CPUE |
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Zusammenfassung |
A dynamic model for open-access fisheries is presented. In addition to density dependence in recruitment and fishing effort changing in proportion to the level of profit fishermen earn which characterizes previous open-access models, it incorporates full age structure for the fish stock, lognormal environmental recruitment variability, and gear selectivity. The predator-prey cycling solution of the original Schaefer dynamic model, and subsequent open-access models, persists for these model extensions. Density dependence in recruitment induces greater global stability. Environmental recruitment variability, common in marine populations, is destabilizing in the neighborhood of the open-access equilibrium. Approximating model steady states of effort and catch by the corresponding averages from data time series underlies a new algorithm of parameter evaluation, applied here to an open-access model of the Georges Bank sea scallop (Placopecten magellanicus) fishery. |
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South Australian Res. Dev. Inst., 2 Hamra Ave., West Beach, S.A. 5024, Australia |
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Rufnummer |
525 |
Signatur |
2324 |
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