Doitsu

Doitsu pronounced Doh-Eet-Sue (German-scaled fish) typically describes Koi with no scales other than enlarged scales along the lateral line and two lines running on either side of the dorsal fin. In Japan, the Doitsu classification applies only to Go Sanke, while in Western shows there is no separate category for any German-scaled fish, with the exception of Shusui. However, the growing popularity of these virtually naked-skinned koi suggests that some revision may be necessary, so that Doitsu scalation can be recognized for what it is; an intriguing and challenging variation on the endless theme of Nishikigoi.

There are a few Doitsu Koi with their own names, such as Shusui and Kumonryu. Any other koi that would fit into a separate classification yet dons Doitsu scalage would have an extra prefix or suffix of "Doitsu" such as Doitsu Kohaku or Hariwake Doitsu. Whether you place Doitsu before or after the main classification of the koi is of no real consequence either way.

Keep in mind that Doitsu are not necessarily scaleless Koi except for a few larger scales along the spine and lateral line. There are Doitsu specimens with the thick German scales all along their body length and width, which gives them the appearance of wearing a suit of armor. While these rare Doitsu are not valued very highly at koi shows, they make for a very interesting and unique Koi, perfect for a treasure-hunting hobbyist. On the flip side of this, Doitsu don't always have scales along their sides and sometimes do not even have scales by their shoulders. However, Doitsu always have German scales on either side of their dorsal fin whether or not the scales can be found elsewhere on their body.

All patterned Doitsu Koi should have clearly defined markings. Without scales to diffuse the light, colors appear bright and sharp. A good Doitsu should seem like it's lit from within.

The Koi-buying public is becoming more and more attuned to this style of Koi. Their sales are increasing year after year and when you consider that any koi, except for Ginrin, can be produced in a Doitsu version, that is hardly surprising.