Resumen del producto

Species of the genus Tegula are characterized by having a globular to conical shell, 12 to 51 mm in height. Even though these species have no commercial importance, they coexist with some species of high commercial value such as the abalone and spiny lobster on the western coast of Baja California, which is cata­logued as one of the most important fishing areas of Mexico. In this study, the population composition of T. aureotincta and T. eiseni, their changes throughout the year and their biometric relationships in the western coast of Baja California Sur, from January 2006 through April 2007, were analyzed. A total of 552 specimens were sampled by skin diving in Bahía Asunción, Baja California Sur. The results showed the smallest individuals of T. aureotincta (<15 mm BD) were caught in June and November, suggesting two recruitment periods; the largest specimens (31 mm BD) were obtained in July. For T. eiseni the smallest specimen (10 mm BD) was recorded in February, suggesting only a single recruitment period for this species; the largest organism (23 mm BD) was collected in January. The monthly sex ratio was not significantly different from 1F:1M (P > 0.05) for both species. However, for T. aureotincta the sex ratio was biased towards males in October (0.18F:1M, P<0.05), and for T. eiseni it was biased towards females in January and towards males in February (4.5F:1M, and 0.4F:1M, P<0.05, respectively). The BD-SH relationship was powerful, with a significant fit (T. aureotincta R2 = 0.950 and T. eiseni R2 = 0.8086, P< 0.001). Both species showed positive allometric growth (T. aureotincta b = 1.3814 and T. eiseni b = 1.4737), which suggests that this could be a characteristic of conical shaped species of the genus Tegula.

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