When one or two eyes and nostrils were blocked, the fish could still feed as normal, indicating that the vision and olfaction do not function in prey for the fish as the organs have been degenerated as it has fully adopted habituating dark and bottom water. However, its lateral lines have been developed with strong sensing. Once the lateral lines were disabled, its daily feeding was largely reduced. In addition, our study shows that the combination effect of nostrils-and-lateral-line blocking was remarkably greater than that of eyes-and-lateral-lines blocking, indicating its importance of sense is in order of tactility, olfaction, and vision. Moreover, when all the three senses were disabled, C. semilaevis could still feed partly, a possible explanation for that is the tactile function by fins and head.

Blinded C. semilaevis could attack various types of preys and artificial preys in low movement, and also still and fresh dead clam. The moving frequency affected the feeding very weakly, and the attacking for moving and fresh dead clam was quite often. The taste sense of the fish is highly developed, allowing the fish to snap and swallow fresh clam but rotten clam or plastic globule. Seemingly, the oral cavity is more sensitive to taste than to texture.

It is shown that C. semilaevis attacks mainly its preys by lateral line sensing. When the lateral lines were working, the olfaction co-works, depending partially on the feeling by fins and head. The taste sense is used when snap and swallow. The lateral lines play effective role on preying, which may explain why C. semilaevis feed artificial diets unwillingly that supplied in normal schemes.