Batfish are not good or best swimmers; they use their highly-adapted pectoral "leg" fins to "walk" on the bottom of ocean surface. When the batfish reaches adulthood, its dorsal fin becomes a single spine-like projection, it has the function primarily as a lure for prey. The Red-Lipped Batfish has an anatomy on its head known as illicium like other anglerfish. This structure is employed for attracting prey.
This fish survive on the rocky seabed of the Pacific ocean. Because the floor is skech out and spiky, it prefers not to swim along the bottom like a flounder - instead it has evolved pectoral fins that work like legs to ‘walk’ along the seabed.
The batfish uses their red lips to help improve species recognition when searching for a mate. So, it has real function as for us human being living on the surface of the earth.