Abstract
In this study, by means of the sagittu otolith analysis, five and six age groups and the relation age-length of Mugil cephalus and M. curemu, respectively, in Tamiahua Lagoon, Veracruz (Mexico), are established. The anatomy of the scales and sugitta of both species is described. The fast growing bands on the edges show that their formation was higher from March to August for M. cephulus, and from July to November for M. curemu. The development of those bands was related to the spawning migration in both species. The constants of the growth equation of von Bertalanffy were calculated for the species and their sexes, using the scales and the otoliths. Differences in growth between sexes were detected; generally, the females reach a bigger size than the males at the same age in both mulle species. The scales and the otoliths may be used indistinctly in the age determination of both sexes of the species; nevertheless, the otolith showed a better tit to the growth equation.
Highlights
El análisis de la edad es uno de los parámetros más importantes en el estudio de la dinámica de poblaciones
The scales were identified by means of the annual rings that included a fast growth mark and a slow growth mark
In M. curema, the percentage of otoliths with fast growth bands in the margin is higher from July to November, while the percentage of otoliths with slow growth bands in the outer edge is higher from December to May
Summary
El análisis de la edad es uno de los parámetros más importantes en el estudio de la dinámica de poblaciones. Entre los mejores métodos para el estudio de la edad en peces se encuentra la identificación de las marcas de crecimiento, que se forman periódicamente en estructuras duras del pez, como son las vértebras, escamas, espinas y otolitos. En el presente trabajo se han empleado las escamas y los otolitos sagitta de Mugil cephalus y M curema para aplicar las técnicas correspondientes a la determinación de la edad. Se han realizado los estudios siguientes: (1) descripción de las escamas y de la sagitta; (2) determinación del tiempo de formación de las bandas de crecimiento rápido y lento, en el otolito derecho de la sagitta, en relación con el ciclo anual; (3) obtención de la relación edad-longitud por medio de las escamas y la sagitta así como su comparación; (4) obtención de los parámetros del crecimiento
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