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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.
Nutrition and Omega-3s. Nutrients found in foods are usually straightforward. When choosing fish, people generally want to know which types are highest in omega-3 fatty acids. Concerning omega-3s alone, the following chart ranks the omega-3s in fish from highest content to lowest.