How are the eyes of a stonefish?

Stonefish live among rocks in the sea. They have wide, turned-down mouths and small eyes. Their skin is the same colours as rocks. This makes a stonefish took like one of the rocks.
    Sometimes a swimmer will step on a stonefish. Then the fish will shoot some liquid into the swimmer’s foot. The foot will become bigger and start to hurt. It may hurt for a long time. Because of the fish like the stonefish, the sea floor is sometimes not peaceful as it looks.