Size3.5 inches (9 cm)
RangeWestern Pacific Ocean
- Can reach a maximum size of about 3.5 inches (9 cm).
- Appears in a variety of colors including purples, reds and oranges. Male has different coloration from female; colors are more vivid for males than females.
All Bartlett’s anthias begin life as female – some individuals then change sex and become male as adults.
- Diet consists of zooplankton.
- Occurs in tropical marine environments in the Western Pacific Ocean from Palau through the Caroline, Marshall and Fanning Islands.
- Found on coral reefs at depths from 13-98 feet (4-30 m).
- Lives in large groups with few males and several dozen females and juveniles. Groups appear in areas of branching corals where the fish are able to find shelter.
- Active during the day and spends most of its time swimming above the coral reef and feeding on plankton.
- Forms huge schools that are actually made up of small coexisting social harems.
- Each harem is usually led by the largest, most colorful male; several smaller, less dominant males; a group of females; and juvenile fish.
- The dominant male constantly defends its place in the group’s hierarchy by challenging the lesser males as well as other males from neighboring harems.
- At dusk, the dominant male from each harem participates in “courtship dances” that entail frenzied, zig-zag swimming patterns that attract the females from their group and lead to coinciding spawning in the aggregation.
- Sequential hermaphrodites; individual can change gender from female to male. All begin life as females.
- “Not Evaluated” on the IUCN Red List.
- Due to environmental or social factors, such as the male dying, some females can become males. Sex-change ensures there will always be a male and a female to reproduce. The replacement is capable of changing her sex to male in a period of 2 to 3 weeks. The change cannot be reversed.
- Reef Fish Identification – Tropical Pacific. Allen, G.; Steene, R.; Humann, P. and Deloach, N., pg. 138