Biometría y longitud de migración de Penaeus stylirostris (Crustacea: Penaeidae) en tres zonas de captura en la costa de Sinaloa, México

In Mexico, blue shrimp Penaeus stylirostris the most important fishing resource, being harvested at its maximum sustainability. P. stylirostris is considered because the maximum recorded sizes, the priority shrimp specie for human consumption and therefore, highly valued in the national (Mexico) and international markets. The objetive was to analize: biometric relationships and size at migration of the blue shrimp in three catch areas (bay, litoral and marine or offshore) from Santa Maria La Reforma (SMLR) lagoon, Sinaloa, Mexico. The zones were, used as areas for protection, feeding and growth of blue shrimp. Shrimp catch was analyzed in three-year period (2016 – 2018 seasons). The catches in protected water were obtained by, boats smaller than 8 meters (m), using “suripera” nets. On the littoral area a 12 m boats were used at offshore zone catches were by a research vessels (CRIAP Mazatlan) on the continental zone off SMLR. In P. stylirostris organisms, sex differentiaton and sex ratio (?2) were measured. The organisms were determined by the total length (TL) in millimeters (mm) and their total weight (W) in grams. Biometric relationships were obtained and relative growth of the Blue shrimp was estimated. By fishing area, the migration size (TL50%) of P. stylirostris was estimated by the logistic method. 32.345 organisms were analyzed, the greatest value was L = 245 mm recorded at marine and lowest value was TL = 65 mm inside the bay. On average the largest specimens correspond to the offshore (183.03 mm) and the smallest one to the bay (144.18 mm). The means of TL were significant different between the fishing zone (P < 0.0001) and among sex (P < 0.001). The proportion of females with respect to the males was higher in almost all zones. High dependence between the variables (TL-W) were obtained, indicating isometric growth (P = 0.05), The mean migration size of 159.2 mm (TL) was estimated, furthermore due to its sizes and abundance of P. stylirostris, represents a species of commercial and nutritional interest for fishermen of the coast of Sinaloa, Mexico.