About Scarus altipinnis (Steindachner, 1879)
Terminal Male Identification
Scarus altipinnis can be told apart from other species in the genus Scarus by the slightly elongated middle fin ray on the dorsal fin of terminal-phase males. These males have green patterning toward their tail, two bluish-green bars on their chins, and similarly colored spots and lines around the eye and operculum. They also have crescent-shaped tails with slightly lengthened filaments at their center.
Female and Juvenile Appearance
Initial-phase females are brownish with scattered white spots, while juveniles have stripes or mottled patterning and a distinct yellow head.
Maximum Size
This species reaches a maximum total length of 60 centimetres (24 in).
Geographic Distribution
Scarus altipinnis is distributed in the western Pacific Ocean, ranging from the Ryukyu Islands south to Lord Howe Island, and across Micronesia to the Line Islands and Ducie Island.
Grouping Behavior
This species is often found in large groups.
Habitat Preferences
Adults are typically found along the reef margin of seaward reefs, while juveniles and subadults live in shallow protected reefs.
Feeding Habits
It grazes on algae at depths between 1–50 metres (3.3–164.0 ft).
Social Structure
Adults and subadults are social, while juveniles are usually solitary.
Reproduction
It is an oviparous species, and mating males and females form pairs to spawn.
