The lionhead is a hooded variety of fancy goldfish. This fish is the precursor to the ranchu.
The tremendous hood or headgrowth and fat cheeks of lionheads give them a facial appearance similar to canine puppies.The “wen” (Chinese term for headgrowth) fully covers the head, cheeks and gill plates of the fish. Furthermore, lionheads have short but deep bodies, and relatively straight or evenly arched backs without dorsal fins. The finnage, in general, is short. Breeding standards require that the lionhead’s anal fins are paired, the double tail fin should not droop, and its upper edges should be held away from the body.
Lionheads can grow up to 6 inches (15 cm) in length (including finnage) and may have metallic, nacreous or matte scales.They are available in orange, red, white, red-and-white, blue, black, black-and-white, black-and-red, natural, and chocolate coloration.
Lionheads are sometimes sensitive to low water temperatures. Due to their slow nature, they should not be kept with faster moving fish such as comets, common goldfish, and shubunkins. If kept in an aquarium, the recommended tank size for one fish is 20 gallons with double filtration. They are social fish so tank mates are recommended. They should be kept in a species-only tank with other goldfish. It is advised to feed goldfish only sinking food because flakes can cause swim bladder issues. Lionhead goldfish are omnivores so they thrive on a diet rich in plant and animal matter. High-protein diets will make their colors more vibrant and will cause greater growth.