Feeding your fish King British Bloodworms is the simple way to let your fish enjoy the benefits of natural live food, as they would in the wild. Blood worm is a natural worm, freeze dried immediately after harvest to retain flavour and nutritional value. For tropical, coldwater and marine fish. Also for turtles and terrapins. • Helps complete a balanced diet • Promotes colour and condition • Natural freeze dried fish food • Rich in protein.