Ranchu
| Country of origin | Japan |
|---|---|
| Type | Fantailed |
| Classification | |
| BAS | |
The Ranchū (蘭鋳, 蘭虫, 卵虫; "Dutch worm"), also Maruko, is a hooded variety of goldfish native to Japan, which lacks a dorsal fin. It is referred to as the "king of goldfish" by the Japanese. Maruko more commonly refers to the egg-fish goldfish.