Dave is an orange fish. He has made many cameo appearances. His first appearance was in the episode "Karate Choppers."
He is a relatively tall red-orange fish with light yellow/tan fins and light olive green lips, and wears a light blue top. He looks like Frank, except, unlike Frank, his eyes are on the top of his head. It is possible that he is a relative of Frank or that he is the same person because they look alike.