The harlequin bass is a small fish that typically measures around 4 inches in length.

Its body is elongated, with distinctive coloration ranging from light brown to yellow on its underside, particularly around the head, where broad black marbling is present.

The harlequin bass inhabits coastal waters along the western Atlantic, from Florida in the north to Brazil in the south. It is also found in the Caribbean Sea and around the Bahamas.

The harlequin bass generally inhabits coral reefs, rocky bottoms, and shallow seagrass beds, but it can also be found at depths of up to about 164 feet. This solitary, territorial fish hides in rock crevices and cavities to escape predators and ambush its prey.

The harlequin bass is an opportunistic predator that feeds mainly on small fish, crustaceans, and cephalopods. With its excellent eyesight, it spots prey and hunts by ambush.

The harlequin bass is a simultaneous hermaphrodite: each individual has functional male and female reproductive organs at the same time. Reproduction takes place in pairs, with both partners alternating sexual roles during successive spawning events. The eggs are released and fertilized in the water, where they develop in open water

The harlequin bass is listed as many other marine species within The IUCN Red List of threatened species. The harlequin bass appears in the IUCN Red List since 2010 within the category Least Concern !