Originated by cross breeding numerous different established varieties with "scale-less" German carp (generally, fish with only a single line of scales along each side of the dorsal fin). . There are four main types of "Doitsu" scale patterns. The most common type (referred to above) have a row of scales beginning at the front of the dorsal fin and ending at the end of the dorsal fin (along both sides of the fin). The second type has a row of scales beginning where the head meets the shoulder and running the entire length of the fish (along both sides). The third type is the same as the second, with the addition of a line of (often quite large) scales running along the lateral line (along the side) of the fish, also referred to as "Mirror koi". The fourth (and rarest) type are referred to as "Armor koi" and are completely (or nearly) covered with very large scales that resemble plates of armor.
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