About Premnas biaculeatus (Bloch, 1790)
Description: The defining characteristic of this fish's genus is a spine located on the cheek. Body color and bar color vary based on the fish's sex and geographic location. Despite its common name maroon clownfish, only some females have a maroon body color; their body color can range as dark as dark brown. Juveniles and males are bright red-orange. This fish has three body bars that can be white, grey, or yellow. If a female's bars are grey, they can rapidly change to white when the fish is provoked. Due to a size-based dominance hierarchy within any group of anemonefish, the female is always larger than the male. This species shows a significant size difference between sexes: females are among the largest anemonefish, growing up to 17 cm (6.7 in), while males are much smaller, usually reaching 6–7 cm (2.4–2.8 in) in length. Distribution and habitat: Premnas biaculeatus (previously referenced as A. biaculeatus) occurs in the Malay Archipelago and Western Pacific Ocean, north of the Great Barrier Reef.
