The objective of this research was to determine the degree of use of the natural resource (blue crab-Callinectes sapidus) in the Ciénaga Grande of Santa Marta (CGSM), in order to generate biological information of interest for the responsible management of the natural resource. A quantitative study was developed. Data is processed through frequency and percentage measurements for each variable (sex, shell length- Lca, shell width- Abel, maturation), The data is processed through frequency measurements and percentages for each variable, regression graphs, frequency tables to know the size structure. 2346 specimens collected, presenting 47% of the catches below the average size at maturity. In 2018 there were increases in catches with a ratio of 9:2; while in 2021 the largest Abel (9.55cm), carapace length in centimeters-Lca (5.74cm) and weight (106gr) were recorded, that they probably present a moderate risk of exploitation.