Something to consider...
When purchasing fish, wild fish from northern waters are preferable to farm-raised because wild fish eat a considerable amount of algae, which is a rich source of omega-3 fatty acids.
Farm-raised fish are fed cornmeal, and it just so happens that cornmeal is low in omega-3 fatty acids.
Cold water fish are an excellent sources of omega-3 fatty acids, examples include: albacore tuna, mackerel, salmon, sardines, and herring. Dark green leafy vegetables and soybeans are also very good sources of omega-3 fatty acids.