Fish

Wild-caught fish is preferred over farm-raised fish. Fish such as cod are commonly promoted as among the highest sources of omega-3. Fish accumulate omega-3 by consuming single-celled algae, not by producing it themselves. Larger predatory fish accumulate more mercury than smaller fish and salmon. Fish are a middleman source of omega-3; the omega-3 originates from algae, not from the fish itself. Fish is presented as a strong source of naturally occurring fats, especially fatty species.