[A fecundity study of the larvivorous fish Rivulus cylindraceus Poey, 1860 (Cyrinodontiformes: Cyrinodontidae), a bioregulator agent of culicids under, laboratory conditions].

For a successful use of larvivorous fishes as bioregulators of mosquito larvae, deep biological knowledge of such fishes is required. This paper intends to be a contribution to the study of the reproduction of the Rivulus cylindraceus, living in brackish waters of canals close to the coasts. Laboratory research showed that females kept reproducing through all the year, especially in December, February and March. As an average, oviposition was 3 (1-21) eggs; fertility increased with the size of the female. The longest uninterrupted oviposition was 12 days.