Clingfish
Gobiesox spp.

Habitat: Rocky shores and tidepools from the intertidal to 25 feet below low-tide line.

Range: Southern California to Alaska

Maximum Size: 6 inches

Fun Fact: These fish have a suction disk on the underside of their bodies that allows them to cling to the underside of rocks during low tide.

More Pics:

Overhead shot (on an underwater pump!)

Underside view of suction disk

Click here to see video of a clingfish being hand-fed.