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The highest concentrations of omega-3 fatty acids are found in coldwater fish, such as sardines, salmon, herring, tuna, cod, mackerel, halibut, and shark. These fatty acids are also found in lower concentrations in plant foods such as flaxseed, walnuts, Great Northern beans, kidney beans, navy beans, and soybeans.
Foods rich in omega-3 fatty acids include fish, such as tuna, mackerel, herring, salmon and halibut, and certain plant-derived foods, including flax seeds, pumpkin seeds, walnuts and oils made from these foods.