Hikari® Hi-Growth™ is a powerful, supplemental diet specially developed to promote championship form in koi. Kamihata Fish Industries, Ltd., Japan's premier breeder of koi, combines over a century of experience with the latest scientific techniques to produce Hikari® Hi-Growth™. This advanced diet, full of proteins, vitamins and minerals in perfect balance, increase your koi's gloss and luster, as well as their overall size and weight..