The red scorpionfish has a robust body with flattened sides. Its pectoral fins are large and wide and it grows to a length of 20-30 cm. As a bottom-dwelling fish, the red scorpionfish has no need of a swim bladder. Depending on its habitat, its colour ranges from reddish to brown with light and dark marbling.
It moults at regular intervals, often several times a month. It has large scales that are easily removed.
The red scorpionfish is a crepuscular and nocturnal fish. It hunts crustaceans and small fish, its colour providing the perfect camouflage. As an ambush predator, it waits until its prey is close enough before attacking at lightning speed.