The lateral line system,as highly sensitive flow sensors,can be found in most fishes.The lateral line system consists of two types of sensitive flow receptors: superficial neuromasts(SN)and canal neuromasts(CN).Cavefish usually lives in the dark karst caves for most of its time,and the eye of some cavefish are even degenerated.As a result,the lateral line system of some cavefish plays an even more important role in their life than normal fish.