title: Age and growth of the tilapia, Oreochromis niloticus (Perciformes: Cichlidae) from a tropical shallow lake in Mexico.
abstract: Age and growth of Nile tilapia (Oreochromis niloticus) were determined using 1039 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 SL2469. The age data, derived from opercular bone readings, were used to estimate the growth parameters of the von Bertalanffy equation: Lx=17.88 cm, K=0.3409, t0=-1.543, and Winfinity=149.21 g. The oldest male and female were 2.5 years old. The sex ratio (female:male) was of 1:1 (chi2=0.02, p>0.05).
authors.affiliation: Laboratorio de Limnología, F.E.S. Zaragoza, U.N.A.M. Av. 5 de Mayo y Fuerte de Loreto, Col. Ejercito de Oriente, Iztapalapa, C.P. 09230, DF México. lgomez@servidor.unam.mx
authors.forename: José Luis
authors.initials: JL
authors.lastname: Gómez-Márquez
authors.forename: Bertha
authors.initials: B
authors.lastname: Peña-Mendoza
authors.forename: Isaías H
authors.initials: IH
authors.lastname: Salgado-Ugarte
authors.forename: Arredondo-Figueroa
authors.initials: AF
authors.lastname: José Luis
mesh_terms: D000818:Animals; D005260:Female; D008136:Longevity; D008297:Male; D008800:Mexico; D012727:Sex Characteristics; D017210:Tilapia / Q000033:anatomy & histology / Q000254:growth & development*