The quality carp is full-bodied, solid and pink, shiny, with a slight frost on the surface of the body, hypertrophy, translucence, and not red back; the shape of the inferior carp is small and incomplete, and the color is reddish yellow with a dark, dull, frosty appearance. Thick, black red or moldy red on the back. There are two kinds of carp seen in the market: one is the more fat carp of the trunk, the other is called “squid”, and the other is the slender carp of the trunk. Its other name is “squid”, small soft. The common name of the fish is "small tube".