Indian Mimic Tang Care Guide
Acanthurus tristis is an Indian Ocean surgeonfish whose juveniles are Batesian mimics of Centropyge eibli; adults are brown and reach 25 cm.
Compiled by Aquairi from published sources · Published · Updated
Overview
Acanthurus tristis, the Indian Ocean mimic surgeonfish of the family Acanthuridae, has a compressed body with a protruding snout. Adults are yellowish-brown to dark brown with a wide dark band from the chin to the operculum and a white ring around the lower lip. FishBase records a maximum total length of 25 cm.
Taxonomy
- Family: Acanthuridae
- Genus: Acanthurus
- Scientific name: Acanthurus tristis
- Described by: Randall, 1993
Habitat
The species is marine and reef-associated in the Indian Ocean, including the Bay of Bengal and the Andaman Sea west to the Maldives and Chagos Archipelago and east to islands of southern Indonesia at least to Bali, with records from Christmas Island. It occupies shallow lagoon and seaward reefs in areas of mixed coral, rock or sand, with FishBase recording depths of 2-30 m.
Tank requirements
- Minimum tank volume: 600 L (158 gal)
- Temperature: 24-26 °C (75-79 °F)
- pH: 8.1-8.4
- Specific gravity: 1.024-1.026
- Carbonate hardness: 8-12 dKH
- Strong water flow
- Lifespan: 10-25 years
Diet
Acanthurus tristis is a grazer with a low trophic level reported by FishBase. In aquaria it should be offered marine algae and dried seaweed multiple times daily.
Compatibility
A semi-aggressive, diurnal mid-water swimmer. Its juveniles are Batesian mimics of the dwarf angelfish Centropyge eibli, displaying pale brown coloration with orange markings and a black caudal fin with a blue rear margin. Wrasses, clownfish, angelfish and sturdy triggerfish make suitable tankmates, while other tangs of similar shape should be avoided in smaller systems.
Reef compatibility
The species does not eat coral and is considered reef-safe. Maintain carbonate hardness of 8-12 dKH and specific gravity of 1.024-1.026.
Conservation status
IUCN Red List: Least Concern, assessed in 2010 via FishBase.
Indian Mimic Tang (Acanthurus tristis): Breeding Guide
Overview
The Indian Mimic Tang, Acanthurus tristis, lives in the Indian Ocean from the Bay of Bengal and Andaman Sea west to the Maldives and Chagos Archipelago and east to southern Indonesia, at least to Bali. FishBase gives a maximum total length of 25 cm and a depth range of 2 to 30 m. It inhabits shallow lagoon and seaward reefs over mixed coral, rock and sand.
Per FishBase, juveniles mimic the cryptic angelfish Centropyge eibli, while adults are dusky brown. No captive breeding has been recorded for this species.
Spawning Behavior & Trigger
Species-specific spawning data is not given for A. tristis in the consulted sources. As an Acanthurus surgeonfish it follows pelagic broadcast spawning: the genus typically spawns at dusk in brief pair- or group-spawning ascents near the reef edge, often around lunar phases when currents disperse the eggs.
Fertilization is external in open water, with no nest or parental care. The juvenile mimicry of C. eibli serves as protection from predators and is unrelated to any manageable spawning behavior.
Egg & Fry Care
Eggs are pelagic and float in the open water, hatching into transparent acronurus larvae. As in other surgeonfishes, this larval stage can persist in the plankton for more than 39 days before settling onto a reef.
The extended pelagic phase and the larvae's reliance on ocean plankton make home rearing unattainable. Surgeonfish larval culture remains confined to research aquaculture.
Common Challenges
- Open-water spawning leaves no eggs or nest for an aquarist to manage.
- Juvenile mimicry of C. eibli gives no breeding advantage in captivity.
- The long pelagic acronurus stage cannot be supported on aquarium plankton.