Red-lipped Batfish

Fascinating facts about the Red-lipped Batfish

• The red-lipped batfish traverses the seabed by walking rather than swimming, which keeps it in close contact with the sand where its prey hide. Its pectoral, pelvic and anal fins have become limb-like structures that push the body forward in a frog-style gait. This mode of locomotion lets the fish manoeuvre among rocky or sandy substrates without relying on rapid swimming. By staying on the bottom it can ambush unsuspecting shrimp and small fish that drift nearby.
• At maturity the red-lipped batfish develops a single spine-like projection from its dorsal fin, replacing the earlier fin structure. This dorsal spine is thought to function primarily as a lure, drawing prey toward the fish's mouth. The projection appears after the fish is fully grown, coinciding with its shift to a more sedentary, ambush-based hunting style.
• The most striking feature of this species is its vivid, almost fluorescent red lips, which make it instantly recognisable among other batfish. Marine biologists hypothesise that this bright lip colour aids individuals in recognising each other during spawning events. The conspicuous pigmentation may therefore play a role in mate selection and synchronised reproductive behaviour.
• A specialised fin ray called an illicium projects from the top of the head and ends in a light-emitting esca, creating a bright glow that draws prey toward the fish. This lure is especially effective in the dimly lit waters where the batfish lives, at depths of three to seventy-six metres. When a curious creature approaches, the batfish uses suction feeding, expanding its buccal cavity to pull the prey into its mouth.
• Male red-lipped batfish perform a distinctive courtship dance, swaying their bodies and shaking their heads to attract a female partner. Once a pair has mated, the female deposits sticky eggs that adhere to the ocean floor, where they remain vulnerable. The male then assumes the role of guardian, fanning the eggs with his fins to keep water flowing and to deter predators until they hatch.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Red-lipped Batfish

Found only in and around the Galápagos Islands, the Red-lipped Batfish is a spectacularly bad swimmer. It has evolved arm-like pectoral fins it uses to walk along the ocean floor. Its vivid red lips have no confirmed function, though scientists suspect they help with species recognition. It also has a retractable lure on its forehead.

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