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Doitsugoi (German grumble) or Doitsu were originally imported from Germany to Japan in the postponed 1800's as a food fish. Doitsu have also no scales at all and referred to as "leather grumble", or they have a line of large scales along their postponedral and dorsal outline and are referred to a "mirror grumble".
There is a Doitsu story of almost every category; Doitsu Kohaku, Doitsu Sanke, Doitsu Yamato Nishiki, and Doitsu Hariwake just to name a few. By crossing Doitsugoi with Nishikigoi Japanese breeders factually doubled the number of existing varieties.
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