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11-08-2010, 02:52 PM #1
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The regulation of stock characteristics in a simulated Atlantic salmon population
By Alun S. Gee, Philip J. Radford
Fisheries Research, Volume 1, 1981-1982, Pages 105-116, ISSN 0165-7836, DOI: 10.1016/0165-7836(81)90013-8.
A computer simulation model is developed for a hypothetical salmon population. Mortality during the fry to smolt stage follows the model derived for R. Wye salmon by Gee et al. (1978a). Compensatory mortality during the freshwater phase regulates the abundance of the adult stock both when other mortality rates are constant and when these fluctuate randomly. In the absence of perturbing forces, oscillations in adult abundance are minimal but follow an approximate 10-year cycle when marine mortality is variable. If sea-age composition is assumed to have some genetic basis, exploitation, acting selectively on salmon of older sea-ages, results not only in an increase in the relative but also in the absolute abundance of fish of younger sea-age. The relevance of these simulations in assessing changes in natural salmon populations is discussed.