How do some blennies trick other fish while feeding?

The sabre-toothed blenny (Aspidontus taeniatus) employs a sophisticated form of aggressive mimicry to trick other fish while feeding. It closely imitates the appearance, coloration, and dancelike swimming behavior of the cleaner wrasse, a fish that other marine species visit to have parasites removed.12

By simulating the cleaner’s specific movements—such as a swaying dance—the blenny lures unsuspecting fish into approaching it for cleaning services. Once a victim positions itself in front of the mimic and adopts a submissive posture, the blenny takes advantage of the situation by rushing in to bite off a piece of the victim's fin to eat.12

This deception is highly effective because the mimic adapts its coloration and behavior to match local populations of the cleaner wrasse. While experienced fish may eventually learn to distinguish the mimic from the genuine cleaner, the blenny’s ability to replicate these signals remains a successful strategy for securing food.1