PROBLEM TO BE SOLVED: To provide a primary and secondary oxidative product for feeding to animals, for example, a feed supplement in which a content of unpurified fatty acid comprising peroxide, hollow peroxide, aldehyde, ketone, and the like is 0 or the minimum.SOLUTION: The invention provides a method for obtaining a feed supplement for fishes, and a feed supplement for a pellet usable in cultural industry of crustaceans and fishes. The feed supplement according to the invention has a high energy value, and comprises omega 3 essential fatty acid treated with purified fatty acid and vegetable origin triglyceride in addition to anti-oxidant and other additives.
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