1, herring's body color is dark, dark black, herring's body shape is closer to a cylinder, and its abdomen is more round. Black herring is a carnivorous fish. It likes to eat snails, mussels, shrimp and other aquatic animals, especially snails, so it is also called "snail green".

2. The body color of grass carp is earthy green. Grass carp is a herbivorous fish, which mainly feeds on various aquatic plants. Grass carp grows faster, costs less, and it is easier to realize large-scale culture. So herring is not grass carp.