Abstract
Age and growth of Oreochromis niloticus from Lagoon of Coatetelco, Morelos State, Mexico were studied from January through December, 1993. Scales of 318 specimens were collected. Modal length at capture was 10. 5 -11. 5 cm standard length. Scales rings were forrned during December. Back-calculated lengths-at-age showed no significant differences by sexo Four check marks were recorded. According to the growth curve parameters for population, the fish grow at a low rate (k=O.07) until they achieve a size (Loo) of 2 9. 19 cm. Length-frequency analysis (Bhattacharya's Gaussian component deterrnination procedure) do not differ significantly (t-student, p
Highlights
The family Cichlidae, with about 700 species, is the predominant perch-like fish occuring naturalIy in Africa and Madagascar, and in the Central and South America
Fish were measured for total length (TL) and standard length (SL) to the nearest mm and weighed to the nearest g
The rings that continued around the entire circumference of the scale were counted and the total number of these rings was used to estimate the age of each specimen
Summary
The family Cichlidae, with about 700 species, is the predominant perch-like fish occuring naturalIy in Africa and Madagascar, and in the Central and South America. Hes 1972; Morales 1991) They have been introduced into a large number of tropical and sub-tropical countries around the world in the last four or five decades, either accidentally or deliberately. The tilapias are important food fish in aquaculture and they are normally reared in open ponds in the tropics (Soderberg 1990). The Nile Tilapia Oreochromis niloticus (Linnaeus, 1757), is considered a suitable species for rural fish farming, taking into account its fast growth rate, adaptability to a wide range of culture conditions andits high capacity to transform farm waste into protein. The annual production of tilapias in Mexico was 92 891 t in 1994 (Anonymous 1995). This figure represent about 7.9 % of tota!. Studies in this aquatic system are very important, because they are the basis to determine the rate at which a rational exploitation should be carry out
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