EPA and DHA in our Food
In contrast to most other nutrients, EPA and DHA are present in a very few foods only. Plants contain no long-chain omega-3 fatty acids. If fish materials are used in the feed, eggs and poultry can contribute, but only in very small quantities. For a sufficient supply of EPA and DHA fish and seafood are indispensable sources.
Among the varieties of fish and even within one species, the quantity of EPA and DHA are drastically different, depending among other factors on genetic and seasonal influences. The total content of EPA and DHA in salmon can vary from less than 300mg to over 2,500mg per 100g fish.