Resumo

GOMEZ-MARQUEZ, José Luis; PENA-MENDOZA, Bertha; SALGADO-UGARTE, Isaías H  e  ARREDONDO-FIGUEROA, José Luis. Age and growth of the tilapia, Oreochromis niloticus (Perciformes: Cichlidae) from a tropical shallow lake in Mexico. Rev. biol. trop [online]. 2008, vol.56, n.2, pp.875-884. ISSN 0034-7744.

Age and growth of Nile tilapia (Oreochromis niloticus) were determined using 1 039 specimens collected in a tropical shallow lake of Mexico, from January to December 1993. Standard length of females ranged from 9.0 to 16.5 cm and males from 8.9 to 14.8 cm. The standard length-weight relationships for all individuals was BW=0.1207 SL^2.469. The age data, derived from opercular bone readings, were used to estimate the growth parameters of the von Bertalanffy equation: =17.88 cm, K=0.3409, t_o=-1.543, and W=149.21 g. The oldest male and female were 2.5 years old. The sex ratio (female:male) was of 1:1 (X²=0.02, p>0.05). Rev. Biol. Trop. 56 (2): 875-884. Epub 2008 June 30.

Palavras-chave : Oreochromis niloticus; age; growth; opercular bone; sex ratio; Mexico.

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