Size7.8 inches (20 cm)
HabitatReefs at depth from 33-591 feet (10-180 m)
- Comes in a variety of colors, including red, pink, orange, yellow and purple.
- Male characterized by a square magenta-colored spot on side. Female is less colorful than the male.
- Maximum size is about 7.8 inches (20 cm).
- Bullet-shaped and darts about when feeding or defending territory.
All squarespot anthias begin life as female – some individuals then change sex and become male as adults.
- Diet consists of zooplankton.
- Occurs throughout the Pacific Ocean from Indonesia to Samoa, north to the Ryukyu Islands, south to Rowley Shoals and New Caledonia, as well as throughout Micronesia.
- Found around reefs at depths from 33-591 feet (10-180 m).
- Lives in large groups, with few males and several dozen females and juveniles. These groups are found in areas of branching hard corals where they take shelter.
- Active during the day and spends most of its time swimming above coral reef and feeding on plankton.
- Sequential hermaphrodite: can change sex from female to male.
- Begins life as female. Due to environmental or social factors, such as male dying, some females can become males.
- Sex-change ensures there will always be a male and a female to reproduce.
- Female replacing dominant male in a harem’s hierarchy is capable of changing her sex to male in a period of 2-3 weeks.
- “Least Concern” on the IUCN Red List.
- Also known as the “squarespot fairy basslet.”
- Forms huge schools actually made up of small coexisting social harems. Each harem usually led by largest most colorful male. Includes several smaller less dominant males, a group of females and juvenile fish.
- Dominant male constantly defends its place in the group’s hierarchy by challenging lesser males and males from neighboring harems.