Like all flatfish, the common topknot starts its life looking like a typical fish. Early on in development, whilst still in their larval stage, they undergo a metamorphosis from a pelagic symmetrical larvae (same as other fish) to a benthic asymmetrical juvenile (living sideways on the seabed). They are thought to have evolved this way to hide from predators and to be an excellent ambush hunter perfectly adapted to life as a demersal predator fish.
They use what used to be their dorsal, pelvic and anal fins to create suction between their body and the rock. This is achieved by creating an area of lower pressure under their body, meaning they can hang completely upside down in caves and crevasses. This is called venturi-effect adhesion.
Habitat
Rocky habitats, wrecks, reefs and kelp forests
Depth
1-40 m
Food
Small fish, crustaceans, polychaete worms, molluscs and gastropods
Length
Max. length - 25cm
Lifespan
Unknown
Conservation Status
Least Concern (LC)
