Resumo

GOMEZ-MARQUEZ, J.L.; PENA-MENDOZA, B.; SALGADO-UGARTE, I.H.  e  GUZMAN-ARROYO, M.. Reproductive aspects of Oreochromis niloticus (Perciformes: Cichlidae) at Coatetelco lake, Morelos, Mexico. Rev. biol. trop [online]. 2003, vol.51, n.1, pp.221-228. ISSN 0034-7744.

Sex ratio, size at maturity, maturity stages, fecundity and egg diameter of Oreochromis niloticus from Coatetelco Lake, Morelos State, Mexico, were studied from January to December 1993. Sex ratio (male:female) was approximately 1:1.02. Length at maturity was 117 mm (males) and 120 mm (females). The fecundity ranged between 104 and 709 eggs, with egg diameter from 1 000 to 3 000 µm. The gonadosomatic and hepatosomatic index indicate that the species breeds during summer and winter.

Palavras-chave : Oreochromis niloticus; fecundity; gonadosomatic index; sex ratio; Coatetelco lake; Mexico.