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This is not a Goldfish nor Hybrid. Japanese Carassius Long fin type “Tetsugyo“. It's a Natural monument of Miyagi Prefecture. One Fish is changing Color. There are many isolated ponds in the deep mountain around North East Japan. Those varieties were born in this special emvironment. It's said It's a Mutation of “Kinbuna“ Long Fin form / Carassius buergeri subsp.1. var (Miyagi pref) though. Number of Dorsal Fin Comptotrichia is a bit too many for “Kinbuna“. So Probably the Basic Fish is Funa SP. “Nagabun
