Convict Tang Care Guide
Acanthurus triostegus · Saltwater Tang
What Convict Tang look like
The Convict Tang, scientifically known as Acanthurus triostegus, exhibits a distinctive body shape characterized by a laterally compressed, oval form, reaching a maximum adult size of approximately 8 inches (20 cm). This species displays a striking coloration with a base of white or light yellow, adorned with prominent vertical black stripes that extend from the dorsal to the anal fin. Sexual dimorphism is subtle, with males typically exhibiting slightly larger body sizes and more pronounced coloration during breeding periods. A notable defensive adaptation includes the presence of sharp, retractable spines on the caudal peduncle, which can inflict painful wounds on potential predators. Additionally, the species features a well-developed lateral line system, aiding in the detection of water movements, and a robust dorsal fin that aids in maneuverability.
Behavior & temperament
Convict Tangs are generally social fish, often found in small groups or schools, displaying a clear social hierarchy. They inhabit the mid to upper water column, frequently engaging in territorial displays, particularly during breeding seasons. Their breeding behavior involves elaborate courtship rituals, where males exhibit vibrant coloration and perform swimming displays to attract females. In terms of temperament, Convict Tangs can be moderately aggressive, particularly towards conspecifics or similar species, and may establish territories within their home range. They are also known to engage in cleaning behaviors, where they interact with other fish species to remove parasites.
Diet & feeding
In the wild, Convict Tangs primarily graze on algae and detritus, making them herbivorous grazers. In captivity, they require a diet rich in marine algae, spirulina, and high-quality herbivore pellets to maintain optimal health.
Behind the name
The genus name 'Acanthurus' is derived from the Greek words 'akantha,' meaning thorn, and 'oura,' meaning tail, referring to the sharp spines on the tail. The species name 'triostegus' comes from the Greek 'trios,' meaning three, and 'stegos,' meaning roof or covering, likely referring to the three distinct stripes on its body.
Plan your tank
Check the numbers before you buy: tank volume, salinity, salt mix, water changes, and your ongoing care routine.
Keeping Convict Tang?
AquaLens identifies your fish and plants from a photo, tracks water chemistry, and flags health issues early — free on iOS and Android.
