Metal Concentrations in the Tissues of Blue Crabs in the Estuarine Region of the São Francisco River, Northeastern Brazil

Abstract

Objective: This study aimed to evaluate concentrations of metals in the tissues of the midgut gland and muscles of males and females of Callinectes sapidus and C. bocourti from the estuarine region of the São Francisco River.   Theoretical Framework: A critical aspect of the introduction of chemical substances into aquatic systems is the bioaccumulation within the food chain, particularly with respect to contamination by heavy metals. In estuaries, this situation may cause impacts on the biota and pose risks to public health.   Method: Tissue samples were prepared following the procedures described by Sawidis (2011) and analyzed using flame atomic absorption spectrometry.   Results and Discussion: The highest concentrations observed were of Copper, especially in the tissues of females, which may be related to the presence of hemocyanin in the blood, or the need for trace elements by the females to complete their life cycle. It was also found that the muscle tissue exhibited the highest concentrations, indicating potential bioaccumulation in the biota, explaining the concentrations above those established by legislation.   Research Implications: This study has significant implications for public health, as it addresses aspects previously unknown about the fishing of this important resource, serving as a valuable contribution to the establishment of public health and environmental policies. The findings may assist in fishery management and public health measures.   Originality/Value: This study represents the first analysis of metals in crustaceans from the lower São Francisco region and contributes to the existing body of knowledge, offering new insights into the presence of metals in invertebrates from one of the most important estuarine regions in the country.