All types and ages of Koi Optimum Hi Pro ™ Silkworm Carp Fish Food is a special formulation for all carp. It is nutritionally complete and balanced with high quality protein from natural Silkworm, vitamins and minerals. High quality protein source from natural Silkworm to promote growth. Balanced nutrition for excellent conformation. Beta-glucan & Mannan oligosaccharide to improve gastrointestinal health and immune system for overall health. Rich in vitamins C and E to help reduce stress and increase immunity. Specially formulated for complete and balanced nutrition to keep your koi healthy and to help reduce fat deposition.