Population Biology of the Red Swamp Crayfish Procambarus Clarkii (Girard, 1852) in Southern Portugal

Abstract

AbstractPopulation structure and recruitment of Procambarus clarkii were studied from 1989 to 1991 in a freshwater reservoir in southern Portugal. Two distinct recruitment periods were observed, the main one from October to February and a less significant one during spring and summer. With regard to population structure, juveniles were clearly dominant in January and February. The present results suggest that more than one generation per year may occur under favourable climatic conditions.