Wakin Goldfish

The Wakin goldfish, in Japanese terms, are ‘Huna’ bodied goldfish with a single tail (in reference to the popular common goldfish), double tail, or triple tail, while in 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 have been made from it, such as chocolate, blue, red, white, orange, and yellow. There is also a calico Wakin, but its not a full-blooded Wakin line.

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

Other variations

The Watonai goldfish is a cross between the Wakin and the Ryukin.
the aurora is a Watonai with calico color, they are a rare type of goldfish

From Wikipedia

Fresh Water Fish Breeds

Learn about different species of freshwater fish, including popular breeds like bettas, guppies and catfish.