Red-lipped Batfish This fish is mainly known for its bright red lips. Batfish are not good swimmers; they use their pectoral fins to "walk" on the ocean floor. When the batfish reaches adulthood, its dorsal fin becomes a single spine-like projection that lures prey. Similar to the anglerfish the Red-Lipped Batfish has a structure on its head known as illicium. This structure is employed for attracting prey.