Blue Tang
Scientific name: Paracanthurus hepatus
Active reef species that requires large and very stable marine aquariums.
Quick facts
- Approximate size20–30 cm
- Average weight200–400 g
- Life expectancy8–12 years (proper captivity)
- ActivityDiurnal
Basic information
- Habitat: tropical reefs of the Indo-Pacific, in areas with abundant corals and moderate currents.
- Diet: mainly algae and small invertebrates; in aquariums feeds on algae and prepared food for marine herbivores.
- Sexual dimorphism: very little evident externally.
- Predators: large predatory fish and, in juvenile stages, numerous reef inhabitants.
Life in the wild
How this species lives in its natural environment, with the waters, shelters and resources it needs.
Species overview
The blue tang is a striking fish that symbolizes both the beauty and fragility of tropical reefs.
Natural habitat
It prefers reefs with abundant coral cover and algae, where it can graze and take refuge among complex structures.
Behavior
It swims constantly, often forming small groups or mixing with other reef fish.
Special features
Its caudal spines shaped like a "scalpel" give it the common name of surgeonfish.
Conservation and threats
Reef degradation and collection for aquaristics are potential threats; responsible sourcing is promoted.
Curiosities
Striking details about this species that help better understand its biology and role in aquatic ecosystems.
- It is popularly known as "Dory" from movies.
- It has sharp spines near the tail that it uses for defense.
- It is very active and travels great distances in nature.
- It can easily become stressed in small aquariums or with poor water quality.
Welfare profile
Summary of the most critical points if this species is kept in aquariums, ponds or specialized facilities.
Space and facilitiesHigh
In captivity it needs very large aquariums, with live rock, good circulation, and stable parameters.
Water quality and parametersHigh
It is susceptible to stress-related diseases, such as marine white spot.
Handling and stressHigh
It is not suitable for beginners or small aquariums.
Blue Tang in captivity
General information aimed at professional facilities, public aquariums and educational projects. It does not intend to promote capture or impulsive keeping of aquatic fauna.
⚠️ Before keeping fish like this species, it is essential to review local regulations, ensure adequate facilities and minimize impact on wild populations.
Suitable facilities
It should only be kept in established marine facilities, with experienced staff.
Feeding in responsible centers
The diet should include marine algae, specific preparations for herbivores, and some protein food.
Handling and welfare
It is essential to avoid overpopulation and very aggressive companions.
Ethical message
In education it helps to talk about the effect of media popularity on the demand for certain wild species.
Many aquatic species suffer from massive captures, uncontrolled trade and irresponsible releases. The priority should always be to protect rivers, lakes and seas, reduce pollution and consume seafood responsibly.