Conches are yellow, while feces are mostly black. Conch yellow is very elastic and tastes very good, while feces has a strong fishy smell and often contains fine sand, which will affect the taste if eaten by mistake.

In addition, in addition to the conch tail, conch heads and conch gall cannot be eaten. The two small spherical objects in the conch head contain toxins, and eating them can easily cause various physical discomforts. Conch gall grows on the back, is green, and cannot be eaten. It not only tastes bad but also makes people feel uncomfortable.