Health Risk Assessment of Potentially Toxic Metals in Differently Processed Catfish (Clarias gariepinus) from Selected Markets from Abeokuta Southwestern Nigeria.

Abstract

Fish is a significant source of animal protein for humans; however, it has a tendency to bioaccumulate toxicants from the environment. The present study assessed the health risks associated with potential toxic metals (PTMs) in differently processed catfish (Clarias gariepinus) from four markets in Abeokuta metropolis, southwestern Nigeria. A total of 60 samples were collected and analyzed for PTMs using an Atomic Absorption Spectrophotometer. The health risk assessment was evaluated based on the hazard quotient (HQ), hazard index (HI), and cancer risk (CR). Iron concentrations ranged from 8.10 ± 6.80 to 70.7 ± 30.8 mg/kg, making it the highest measured metal in the fish samples. The mean chromium (Cr) levels (0.25 ± 0.25 to 28.4 ± 14.5 mg/kg), and lead concentrations (< 0.08 to 0.80 ± 0.70 mg/kg) exceeded the permissible limits set by the joint FAO/WHO, in most of the differently processed fish samples. Principal component analysis identified two likely sources of metal contamination in the fish samples as pond/river runoff and vehicular emissions. The health risk assessment revealed a HQ for Cr exceeding the permissible limit of 1.0 across all processed catfish consumed by both adults and children. Similarly, the CR values for Cr surpassed the threshold of 1.0 × 10⁻4 in both age groups. Chromium accounted for 43% to 98% of the contributions to both carcinogenic and non-carcinogenic health risks. The findings indicated that children are more susceptible to the adverse health effects of PTMs than adults through the consumption of variously processed catfish.