The koi fish variety without scales is called Pi carp, which is a variety of German carp. Its skin is like leather, with no scales all over it, or only a row of scales along its dorsal fin. Edible and strong. It has won many people's love with its colorful colors, ever-changing patterns, strong body shape and lively and steady swimming posture.

Scaleless mirror carp is now called skin carp. There are many species of CYPRINIDAE, including more than 200 genera and more than 2,000 species. Carp was first introduced to China from Central Asia, and then introduced to Japan about 1000 years ago. Large-scale breeding in Niigata Prefecture, Japan. Farmers working in rice fields found that some carp were bright red, so they raised and selected them according to human aesthetics.

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The meat content of the imperial concubine fish is as high as 75.6%~78.4%, but the fat content is only 1.6%. It is a typical fish with high protein and low fat, and its taste is fresh and tender. Crossing with japanese koi, koi fish of leather carp strains such as Dejin, Dehong Bai and Qiu Cui were bred.

By crossing German leather carp with leather carp strains from koi fish and koi fish, such as German Gold, German Red and White, and Qiu Cui. In recent years, a series of silver scales have been cultivated, which makes koi fish have higher ornamental value. At present, there are thirteen strains in koi fish.

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