Sixline

Sixline is a common name most often associated with the sixline wrasse, Pseudocheilinus hexataenia, a small reef-dwelling fish in the family Labridae. The name refers to its distinctive longitudinal markings, and adults typically reach about 6–8 cm in length. The species is prized in the aquarium trade for its bright coloration and active behavior.

Distribution and habitat: The sixline wrasse is native to the Indo-Pacific, ranging from the eastern Indian Ocean to the central Pacific. It inhabits shallow reef areas and rubble zones, usually around live rock and coral structures, at depths of roughly 1 to 40 meters.

Ecology and behavior: Sixline wrasses are diurnal predators that feed on small zooplankton, crustaceans, and other invertebrates found in the reef substrate. They are territorial and may defend a small area, particularly in smaller tanks or when housed with other wrasses. They can be aggressive toward conspecifics or other small fishes, so many hobbyists keep a single individual in a suitably sized aquarium.

In the aquarium trade: They are popular due to their size and color, but require a stable, mature tank with ample hiding places. They generally accept prepared foods such as brine shrimp, mysis, and pellet diets, though they may investigate and nibble at natural tank foods. Compatibility with corals and delicate invertebrates varies; they can nip at certain sessile invertebrates, so potential keepers should assess tankmates and coral sensitivity.

Conservation: The species is not currently listed as endangered, though wild populations are impacted by collection for the aquarium trade in some regions.