Baidu Encyclopedia says that the hybrid crucian carp in April is the top grade of fish, with thick meat, many eggs and delicious taste. Not only that, carp and crucian carp are sweet and flat in nature, and enter the spleen, stomach and intestine, which has the effects of strengthening the spleen and appetizing, benefiting qi and diuresis, promoting lactation and removing dampness. The hotel market likes to "keep fresh" crucian carp. Formaldehyde can make the deteriorated crucian carp "come back to life", and sodium benzoate can make the crucian carp "stay young forever", so these harmful substances should be removed when eating crucian carp.

Carp and crucian carp are tetraploid hybrid fish cultivated by Institute of Aquatic Biology, Chinese Academy of Sciences. The body is black and fat, the abdomen is large and spiny, streamlined, the body is high and flat, the front half is curved, the back contour is convex, and the tail handle is wide; The abdomen is round and has no muscle. The head is short, the kiss is dull and unnecessary, the gill rake is long and the gill silk is slender. Hypopharyngeal teeth are flat, with large scales and slightly curved lateral lines. The dorsal fin is long and the outer edge is flat. Gill rakes are slender, needle-shaped and closely arranged. The caudal fin is deeply forked, the back is silvery gray with a slight yellow luster, the abdomen is silvery white with a slight yellow color, and each fin is grayish white.