Abstract

In order to carry out sustainable exploitation of fishing resources, it is essential to conduct research aimed at estimating population sizes and growth curves, recruitment rates, ages and reproductive size. Although Astacidae are mainly exploited through traditional fishing methods, in some countries commercial fishing has been developed that is increasingly extending to new places, and it is therefore essential to conduct research into basic aspects of the population dynamics of these species. In this study, two species of freshwater crayfish, Procambarus digueti and P. bouvieri, from two lake systems in Michoacan State were analyzed. The sampling period was from March 1991 to July 1995; and two collections were made for P. digueti and for P. bouvieri. In each sample the cohorts were separated along the total length of the freshwater crayfish using Bhattacharya modal progression analysis and the low growth curves and von Bertalanffy model were adjusted accordingly. Showing K=0.44, L?=6.7 and to=0.5635 for P. digueti and K= 0.5697, to=0.22, L?=e for P. bouvieri. Both species continuously reproduce through the year and have a very similar, relatively low growth rate due perhaps to the marked seasonal difference in the systems they inhabit.

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