Spatial Population Structure and Growth of Callinectes sapidus in a Tropical Lagoon System in the Southwestern Gulf of Mexico

• DOI: https://doi.org/10.22533/at.ed.51572626310312

• Palavras-chave: Callinectes sapidus; spatial population structure; coastal lagoons; density and biomass; Gulf of Mexico

• Keywords: Callinectes sapidus; spatial population structure; coastal lagoons; density and biomass; Gulf of Mexico

• Abstract:

  The blue crab Callinectes sapidus is one of the most important fishery resources in the estuarine systems of the Gulf of Mexico. However, knowledge regarding the spatial structure of its populations in tropical coastal lagoons remains limited. This study analyzed the spatiotemporal variation in the density and biomass of C. sapidus in the Mandinga Lagoon System, Veracruz, Mexico, based on sampling conducted between 2008 and 2015 at 13 stations. Density and biomass were estimated per unit area, and their spatial structure was evaluated using descriptive statistics, dispersion index, frequency of occurrence, and χ² tests. Additionally, the weight-length relationship of the carapace was analyzed to determine the growth type. Average density ranged from 1.75 to 35.18 ind/100 m², while biomass varied from 5.05 to 122.04 g/100 m². In all years, an aggregated distribution pattern was detected, evidenced by dispersion index values greater than 1 and confirmed by the χ² test (p < 0.05). The species showed high spatial variability and variable occupancy across stations. Morphometric analysis indicated negative allometric growth (b = 2.85). The results suggest that the C. sapidus population in the lagoon system exhibits a heterogeneous spatial structure influenced by local environmental conditions. This study provides relevant information for understanding the population dynamics of the species and constitutes a scientific basis for the sustainable management of the fishery in the region.