Green carp, commonly known as green root fish, green grass carp, black grass carp, Wu Jing, body longer, cylindrical, slightly pointed mouth, beardless, black spine, belly creamy white, white meat and full, spiny and less. Grass carp is commonly known as grass hybrids, grass root fish, white grass carp, grass green, body longer, also slightly cylindrical, slightly rounded mouth, beardless, spine darker, the whole body tea yellow, belly gray-white, tender meat and less thorns. The main difference between bluegill and grass carp is that the body color and mouth shape is different. Mackerel body color black, mouth slightly pointed; grass carp body color tea yellow, mouth slightly rounded.