Simulation de la structure d'age et definition des cohortes chez Squilla mantis (L.) (Crustacea, Stomatopoda)

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Abstract
A simulation study of the age composition of Squilla mantis provides a new approach to account for the development of the male and female populations based on the analysis of the first two components identified by a variant of principal component analysis. The validity of the statistical model is shown by the agreement between sets of data derived from sampling and simulation with respect to the age composition of the population. A deterministic model of the development of the age composition confirms the suitability of the cohort concept. The duration of the exploited phase of the population is about 3½ years and growth rates can be assessed from the results. The larval, post-larval and first juvenile phases last about 1 year.

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