Feed your koi a balanced treat to add weight and improve luster and sheen. Used by Japanese Koi farmers for centuries, silkworm pupae has high lipid and protein levels. Even your pickiest koi will love the flavour of these delightful and nutritious treats. Silkworm oxidation causes foul smells and health issues, but Hakari Silkworm Selects Koi Treats are developed with a proprietary process that eliminates oxidation. Medium size pellet.