In terms of carp, everyone is familiar to it. Together with several freshwater fish species such as crucian carp and silver carp, it is the most common edible freshwater fish in Chinese aquatic product market. However, there is kind of carp that looks unremarkable, but it is a "noble" among carp. The price of artificial breeding is more than 300 RMB per catty. It is procypris rabaudi, also known as rock carp.

Rock carp is a species of cyprinid in the genus Procypris. It is unique to China. In terms of appearance, rock carp seems no difference from ordinary carps except that it is darker and smaller. Wild rock carp is under China’s second-class protection, so that fishing, let along eating, is prohibited.

However, this rare fish species is now found on the table of people. With the development and maturity of artificial breeding technology, the large-scale breeding of rock carp has achieved breakthroughs. There are production areas in Sichuan, Chongqing and other places. Rock crap has been loved by people in the middle and upper reaches of the Yangtze River because of its advantages such as tender meat, anddelicious taste.