Red carp is like this: /i? ct=5331648& z=& tn=baiduimagedetail& word=%BA%EC%C%F%D3%E3& in=3166& cl=2& cm=1& sc=& lm=-1& pn=238& rn=1& di=247294768& Ln=79
There are three points to distinguish: 1. Look at the tail. The tail of grass goldfish is very long. Some red and white grass goldfish are almost as long as their bodies, and the tail tips are separated in the up and down directions, which makes them swim slowly, very natural and easy to catch. Koi fish's tail is very short. It swings strongly when swimming, and swims fast when frightened. It's hard to catch. 2, look at the mouth shape. The mouth of the grass goldfish is flat and forward, just like a human mouth, koi fish's mouth is curved downward, because koi fish likes to dig for food, and the downward mouth makes it easy for them to eat snails, shrimps and other foods in the sediment. 3. Look at the top of your head. The head of grass goldfish is relatively round, while the head of koi fish (especially the head of koi fish) will slightly protrude, which looks very bony.