Mercury (Hg) concentration in fish commercialized in the São Luís fish market (MA) and potential exposure of consumers

Abstract

Fish consumption is the main path of human exposure to Hg and may represent a risk to public health, even with low Hg concentrations in fish, if consumption rates are high. This study quantifies, for the first time, the Hg concentrations in nine most commercialized species in the São Luís (MA) fish market, where fish consumption is high, and estimates human exposure. Average Hg concentrations were highest in carnivorous species, yellow hake (Cynoscion acoupa) (0.296 mg kg^-1), the Atlantic croaker (Micropogonias undulatus) (0.263 mg kg^-1), whereas lowest concentrations were recorded in iliophagous Mullets (Mugil curema) (0.021 mg kg^-1) and the Shorthead drum Larimus breviceps (0.025 mg kg^-1). Significant correlations were observed between Hg concentrations and fish length in two species: the Coco-Sea catfish (Bagre bagre) and the Atlantic bumper (Chloroscombrus crysurus), but not in the other species, since they presented relatively uniform size of individuals and/or a small number of samples. Risk coefficients, despite the relatively low Hg concentrations, suggest that consumers should limit their consumption of Yellow hake and Atlantic croaker, as they can present some risk to human health (EDI > RfD and THQ > 1), depending on the frequency of their consumption and the consumer’s body weight.

Key words Contamination; fish; human exposure; risk assessment