Growth of the Shortnose Mojarra Diapterus brevirostris (Perciformes: Gerreidae) in Central Mexican Pacific

Manuel  Gallardo-Cabello; Elaine  Espino-Barr; Esther Guadalupe  Cabral-Solís; Arturo  García-Boa; Marcos  Puente-Gómez

Growth of the Shortnose Mojarra Diapterus brevirostris (Perciformes: Gerreidae) in Central Mexican Pacific

Autores

Manuel Gallardo-Cabello

Elaine Espino-Barr

Esther Guadalupe Cabral-Solís

Arturo García-Boa

Marcos Puente-Gómez

Editor

Universidad de Colima

Descripción

Samples of Shortnose Mojarra Diapterus brevirostris were obtained from the commercial catch from April 2010 to July 2012, morphometric data of 394 individuals were registered. The growth study entailed two methods: length frequency analysis and study of sagittae and asterisci otoliths. Both methods identified six age groups. Growth parameters of von Bertalanffy’s equation were determined by Ford-Walford and Gulland methods and by ELEFAN routine adjustment. Both methods gave the same results: L∞= 48.61 cm, K= 0.135, to= -0.696. Mean size for each age was: age 1= 9.97 cm, age 2= 14.86 cm, age 3= 19.13 cm, age 4= 22.87 cm, age 5= 26.12 cm and age 6= 28.97 cm. The allometric index from the weight-length relationship was isometric and b= 2.977, the longevity was of 21.5 years. The growth ring is marked because of the metabolic changes in the fish together with its response to environmental factors. The use of the growth parameters obtained by different methods is a robust result in the use of fishery models.