In the region subjected to high anthropogenic metallic inputs, local rejects led to a higher accumulation in fish belonging to the benthic environment. In contrast, in the unaffected region, bioaccumulation was more associated with the pelagic ecosystem, where the metallic transfer to fish depended on the phytoplankton phylum on which the food web was based. This study suggests that microphytoplankton (i.e., diatoms and dinoflagellates) were a more important source of accumulation than nano- and picoplankton species.