The dusky grouper Epinephelus marginatus is predator fish subjected to be impacted due to the contamination of their habitats. A viable source of metal contamination, i.e., copper (Cu), in this species is the ingestion of contaminated food. The objective of this work was to verify the toxic effects of Cu contaminated feed in dusky grouper. A 15 days trial was conducted with three treatments: control, 1 g and 2 g Cu/kg of fish feed. After the trial, the gut was analyzed for Cu concentration and the liver for SOD and GST activity. The Cu concentration in the intestinal tract was significantly greater in fish from contaminated treatments when compared with control. The SOD was significantly lower in contaminated fish, and the GST did not show differences among treatments. Copper showed to be toxic for the species, as evidenced by gut accumulation and suggested by SOD response.
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