コロンビア、メタ川産渡りナマズのセレン/水銀モル比とセレンの健康便益値

The study estimated the risk associated with the consumption of five large migratory catfish species for the health of the most vulnerable population, identifying the total mercury and selenium concentrations, the Se/Hg molar ratio, and the Health Benefit Value for selenium (HBVSe) in fish caught in the upper Meta River (Colombia). Total mercury concentrations ranged from 0.154µgg-1 wet weight (ww) for a sample of Pseudoplatystoma fasciatum to 1.86µgg-1 ww for a sample of Pinirampus pirinampu. Forty-five percent of the Pinirampus pirinampu samples and two of the three Brachyplatystoma rousseauxii samples exceeded the reference level for mercury in saltwater predatory fish. Selenium concentrations ranged from 0.059 to 3.16µgg-1 ww. The species with the highest average selenium level was Pseudoplatystoma fasciatum, while Brachyplatystoma platynemum showed the lowest. Significant differences in Se/Hg molar ratios were found among all fish species, with Pseudoplatystoma fasciatum displaying the most favorable ratio. No linear relationship emerged between Hg and Se concentrations. The maximum allowable weekly consumption of Pseudoplatystoma fasciatum to meet the Food and Agriculture Organization (FAO)/World Health Organization (WHO) recommended Provisional Tolerable Weekly Intake (PTWI) -calculated using the average mercury concentration for females and childbearing age- amounted to 281 g and 140 g for children. In Brachyplatystoma juruense, Brachyplatystoma platynemum, and Brachyplatystoma rousseauxii, which had a Se/Hg molar ratio of less than 1 and an adverse HBVSe, the acceptable intake for this population decreases to about 100 g for females and 50 g for children, respectively. These recommended portions protect against mercury neurotoxicity and selenium deficiency, especially in the most sensitive populations.