Innurco - Tricker Fish Food. "Innurco" is a special sinking fish food that was developed at Tricker's over 80 years ago. Feed your fish with a sinking fish food as nature intended. Innurco remains a household name for fish food in outdoor ponds and aquariums. The formula of ingredients was developed by one of Tricker's chemist for the purpose of breeding and raising healthy fish. You are guaranteed a wholesome freshly made fish food with no preservatives and made with fresh, pure spring water. Provides both tropical and cold water fish, such as KOI and Goldfish a balanced diet. The fish food evens supports fresh water Daphnia (read more about Daphnia by clicking HERE.) For the money, it is the best value. Pound for pound this is one of the BEST COST SAVINGS fish food and is one of our BEST selling fish foods!