ESTUDO POPULACIONAL DO CAMARÃO ROSA, Penaeus brasiliensis, (LATREILLE, 1817) E Penaeus paulensis (PEREZ-FARFANTE, 1967)

Mello, J. de T.C.

The purpose of this work is the determination of the influence of the fishery on the mortality rate of Penaeus brasiliensis and Penaeus paulensis (pink shrimp). The informations that we have obtained are important for Fishery Research, Ecology and other biological studies. These informations allow us to know about the behavior of a population when some individuals are eliminated. This work deals with the elimination due to fishery, which is similar to the elimination due to predation, pollution, etc. We come to the following conclusions: The populations of P. brasiliensis and P. paulensis presented periodical reproduction, giving rise to natural age classes. There is one main spawning per year by June-July for P. paulensis and September-October for P. brasiliensis. This type of information is basical for the applied methodology. We correlated the mean total length (L), in centimeters, with age (t), in months (growth curve), by means of the von Bertalanffy expression resulting: for P. brasiliensis - female: Lt = 20.5 (1-e-0.2lt) for P. paulensis - male: Lt = 16.5 (1-e-0.20t). This re1ationship reinforces our previous conclusion about the existence of natural age classes. The mean total length (L) was correlated with the mean weight (W), in grams, by means of the expression: W = aLb, resulting: for P. brasiliensis female: W = 0.0101 L2.96), male: W = 0.0062 L3.ll; for P. paulensi