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Resumen del producto
Cota-Hernández, G.G., F.N., Melo Barrera & M.T., Villalejo Fuerte
(2011).
Age and growth of thorhy osyter Spondylus calcifer (Carpenter, 1857) in the central region of Gulf of California (Agua Verde, B.C.S.), México.
44th Western Society of Malacologists Annual Meeting and 12th National Biennial Meeting of Malacology and Conchology of The Sociedad Mexicana de Malacología, A.C..
La Paz, Baja California Sur, México, México, junio 27 - 30, 2011,
162.
Age and growth of thorhy osyter Spondylus calcifer (Carpenter, 1857) in the central region of Gulf of California (Agua Verde, B.C.S.), México
Gladys Guadalupe Cota-Hernández, Felipe Neri Melo Barrera y Marcial Trinidad Villalejo Fuerte
It ranges from the Gulf of California to Peru, inhabiting shallow waters (1-25 m) on rocky and sandy shoals attached to fragments of rock or coral. This species is under special protection (NOMECOL-059-2001). Although it is not subject to commercial exploitation, there is interest in its capture by coastal fishermen. Because studies on its age and growth are scarce, the aim of this study is to estimate the age and individual growth of S. calcifer. These data are necessary for the proper management of resources. We collected 385 shells, recording the height (AC ± 1 mm) of each shell. We cut each shell along the tooth region of the hinge, where age readings were taken. Age was estimated in 306 specimens (79% of total). The rest were discarded because of holes produced by epibionts. When grouped in size ranges between 4.3 to 16.9 cm AC, males were more abundant than females in sizes greater than 13 cm AC. We found 15 age groups (0-14), the most representative groups were five, six and four (with 26%, 18% and 15% respectively of the population). There were no significant differences due to sex. It was determined that the formation of growth marks is annual. White bands were formed in autumn-winter and the dark bands in spring and summer, coinciding with the seasonal temperature change (Rs=0.91). We found a significant correlation between the band of dark growth and reproduction (Rs=0.79). Although the parameters of the von Bertalanffy model for males and females were different, there is no noticeable difference in the growth curve by sex (females: AC?=18.33 cm, k=0.15 cm year-1 and to=-2.83 years; males AC?=18.13 cm, k=0.14 cm year-1 and to=-2.88 years). The age of recruitment to reproduction was estimated at 5 years for females and males. Both male and female S. calcifer are long-lived, with an average growth rate. Individual growth and temperature are related to reproduction.
Palabras clave: edad; Spondylus calcifer; Sardinops sagax; reclutamiento reproductivo
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