Wakin

The ''Wakin'' ([https://en.wiktionary.org/wiki/%E5%92%8C#Etymology_1 和]金 lit. "Japanese Golden") is an intermediate twin tailed goldfish variety that has been originated from Japan. It is believed the wakin gave rise to fancy twin-tailed goldfish, including the ''ryūkin'', ''ranchū'', ''oranda'', fantail pearlscale, and many more twin-tailed goldfish. It is also the second oldest variety, developed from the common goldfish. Provided by Wikipedia