Estimation of Growth and Size at First Maturity under a Multimodel Approach of <i>Anadara tuberculosa</i> (Sowerby, 1833) on the Southeast Coast of the Gulf of California

Abstract

The clam fishery in northwestern Mexico encompasses the mangrove cockle Anadara tuberculosa. It is extracted manually, at low tides and between the roots of mangroves. Biological samplings were carried out in Estero Las Lajitas, Sinaloa, from May 2021 to April 2022. A total of 661 A. tuberculosa organisms were analyzed, of which 126 were males, were 363 females and 172 were undifferentiated, yielding a statistically different overall sex ratio between females and males (1♀:0.3♂) (X2 = 113.19; p 3.125) (95% CI 3.027–3.222 for b). To determine the growth of the species, five models were employed: von Bertalanffy, Gompertz, Logistic, Richards, and Gompertz using an oscillatory component (GO). The Akaike Corrected Information Index for Small Samples (AICC) was used. The GO model yielded the lowest AICC (L∞ = 80.98 mm 95% CI 77.59–84.36, k = 1.02 year−1 95% CI 0.89–1.16), a low growth oscillation intensity (C = 0.03), and slower growth in August (WP = 1.67). The Logistic and Gompertz models were used to calculate the size-at-maturity (L50%). Gompertz obtained the lowest AICC with L50% = 32.53 mm (95% CI 30.67–34.31). Considering the lack of biological information and the parameters generated in the present investigation, as regards A. tuberculosa on the coast of Sinaloa, Mexico, its dissemination is essential for the adequate management of the fishery.

Keywords

• black cockle
• Gulf of California
• growth
• maturity
• multi-model approach
• small-scale fishery