Sandaoji carp is a carp variety introduced from Germany, so it is also called "German mirror carp". Heilongjiang Fisheries Research Institute was successfully selected and popularized. Cyprinus carpio grows rapidly, with tender meat and few thorns, and its body size is generally more than two kilograms. Therefore, it is especially popular with Northeasters who like to eat big fish and meat. Now it has become a very popular freshwater fish species in the northeast aquatic products market, and the general price is around per kilogram 10 yuan.

Mirror carp, also known as mirror carp and Mishima carp, is a chordate animal of CYPRINIDAE. Mirror carp mostly inhabit the middle and lower reaches of the water, but mainly live in nutrient-rich turbid still water and have the habit of swimming in groups. Its skin is shiny, its body is stout, its back and head are raised, its head is smaller and its eyes are bigger. The scales on the body surface are large, with 1 row of complete scales from the front end of dorsal fin to the head, and 1 row of symmetrical and continuous complete scales on both sides of dorsal fin; Usually the back is brown, and the sides and abdomen are pale yellow. Mirror carp, with few scales, fast growth, high meat content and good meat quality, was approved as an excellent aquaculture variety suitable for popularization in China by China Aquatic Variety Approval Committee.