Studies on reproduction dynamics and growth of Hoplias malabaricus were carried out in Monjolinho Reservoir (São Carlos/SP) and the following conclusions were reached to: the reproductive period occurs in September and October. The mean values of replection and gonadosomatic index and condition factor increased during the reproductive period. The size of the first sexual maturation of females was observed at 16,7 cm. The fecundity, that is relatively low, was related with total length and weight of females. The growth curve suggests a slow growth of this species.