Resumen del producto

Discrimination of species is an important issue for fisheries management. Thread herring species (Opisthonema liberate, O. bulleri and O. medirastre) on the southeastern coast of the Gulf of California are sympatric and have no noticeable external difference in body shape. This feature, among others, is the cause of his capture is not discriminated by species. Using geometric morphometric, species morphological differences are evaluated through 19 coordinates that define body shape. We randomly selected a sample (n=76 individuals) per species from the catch landed in Mazatlan, Sinaloa, during 2012-2013. Analysis of variations in body shape was performed on digital images. The effect of the size, position and orientation of the spatial configurations of the body images, were eliminated through the procedure of Procrustes superimposition. A canonical variable analysis detected significant difference in the three data sets and the distribution of the scores indicated a clear separation of the three species. In agreement with Mahalanobis distances, the percentage of correct assignation was 88%. Also, the pairwise differences were statistically significant in all cases. This study is an important reference to maximize the use of information about the body shape of the thread herring in the potential allocation of catch per species.[br]

Palabras clave: Mazatlán; morphometric

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