The wakin 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 ryukin, ranchu, oranda, fantail pearlscale, and many more twin-tailed goldfish. It is also the second oldest variety, developed from the common goldfish.

The wakin has many popular cultures and beliefs in the history of Japanese goldfish.^{[clarification needed]} The wakin goldfish, in Japanese terms, are any 'Huna' bodied goldfish with a single tail (in reference to the popular common goldfish), double tail, or triple tail, while in the US, a wakin is simply a double tail goldfish with a long body. They are also seen in red and white, which are prized for competition. Other colors include chocolate, blue, red, white, orange, and yellow. There is also a calico wakin, but for some reason, in regards to its color process, the calico wakin is not a full-blooded wakin line.^[1]

Despite the fish's double tail, breeding is easy as long as young fish are cared for properly.

The watonai goldfish is a cross between the wakin and the ryukin.

Ise Nishiki is a goldfish thought to be cross between the Sakura wakin and the Sakura ryukin.

• List of goldfish varieties

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