Abstract A study on the growth patterns of Callinectes arcuatus was carried out in the Teacapan-Agua Brava Lagoon System, Sinaloa, Mexico, based on monthly sampling conducted from August 2023 to July 2024. A total of 881 individuals were examined, with carapace width (CW) ranging from 25 to 115 mm. The length-weight relationship showed an isometric growth ( ; 95% CI: 2.87-3.02). The sex ratio revealed no significant differences between females and males throughout most of the sampling period. Among the growth models evaluated, the Gompertz with an oscillatory component provided the best fit according to the Akaike Information Criterion, yielding an estimated asymptotic CW of 119.19 mm, a growth coefficient ( k ) of 0.57 year −1 , and a low oscillation amplitude ( ), with the minimum growth rate occurring in November. These findings contribute valuable biological information relevant to the management and sustainable exploitation of C. arcuatus in the region.