Parameters of the Spondylus limbatus GB Sowerby II, 1847, population in the central-West Gulf of California, Mexico

The main Spondylus limbatus population parameters were estimated based on the analysis of
individual growth and reproductive aspects of specimens collected monthly (n = 30) from January
to December 2009 in the fishing area of Agua Verde, Gulf of California. The size structure
determined from shell measurements was 82–167 mm and the direct reading of shell sections
indicated ages of 1–14 years. The data are adjusted to the von Bertalanffy, Gompertz, logistic,
Richards and Schnute (Type 1) growth models. The von Bertalanffy model provided the best fit to
describe individual growth in this species (SH∞ = 142.7 mm, k = 0.47, t0 = −0.20 years). The
spawning season was determined through gonadal histology, and the size and age at sexual
maturity through a logistic model. Reproductive activity occurred from March to September, with
spawning peaks in July and August. The size and age at sexual maturity were 10.79 mm and
2.7 years, respectively. This information provides the necessary knowledge to implement management measures in the area. We recommend independent studies to establish management
measures for each fishing area.