The Lavender Tang (Acanthurus nigrofuscus), also known as the brown surgeonfish or lavender tang, is a species of marine ray-finned fish belonging to the family Acanthuridae. It is found in the Indo-Pacific region and is popular in the marine aquarium trade.

Physical Description

The Lavender Tang has an oval-shaped, laterally compressed body. The overall coloration is brownish to dark brown with a lavender or purplish tint, which gives this species its common name. There are numerous fine horizontal stripes on the body. The dorsal fin has 9 spines and 24-27 soft rays while the anal fin has 3 spines and 22-24 soft rays. This species reaches a maximum total length of 21 cm (8.3 in).

Distribution and Habitat

The Lavender Tang is found in the Indo-Pacific from East Africa to Japan, Hawaii, and Polynesia. It inhabits shallow coral reefs and lagoons at depths between 2 and 20 meters.

Diet and Feeding

The Lavender Tang is herbivorous, grazing on benthic algae and filamentous algae. In captivity, it should be offered a varied diet including marine algae, spirulina, and high-quality vegetable-based preparations.

Aquarium Care

The Lavender Tang requires a well-established aquarium of at least 100 gallons with abundant live rock for grazing. It is semi-aggressive and may display territorial behavior toward other tangs. Generally considered reef-safe.

Conservation Status

Classified as Least Concern by the IUCN Red List.