Quick answer
The blue tang is a vivid royal-blue reef fish with a yellow tail, best known as Dory from the films Finding Nemo and Finding Dory. It lives on coral reefs across the Indo-Pacific, where it feeds mainly on algae and helps keep reefs healthy. Like other surgeonfish, it carries a sharp, scalpel-like spine near its tail that it uses for defense.
Key takeaway
The blue tang is a vivid royal-blue reef fish with a yellow tail, best known as Dory from the films Finding Nemo and Finding Dory. It lives on coral reefs across the Indo-Pacific, where it feeds mainly on algae and helps keep reefs healthy. Like other surgeonfish, it carries a sharp, scalpel-like spine near its tail that it uses for defense.
Overview
The blue tang is a vivid royal-blue reef fish with a yellow tail, best known as Dory from the films Finding Nemo and Finding Dory. It lives on coral reefs across the Indo-Pacific, where it feeds mainly on algae and helps keep reefs healthy. Like other surgeonfish, it carries a sharp, scalpel-like spine near its tail that it uses for defense.
Biology
Blue Tang (Paracanthurus hepatus) is classified as Fish with conservation status Least Concern. Typical weight about 0.6 kg; lifespan around Up to about 20 years.
Ecology
Diet: Omnivore (mostly algae). Habitat: Indo-Pacific coral reefs. Movement and social systems reflect those pressures.
People and this species
Learn before you travel or keep related pets. Wild individuals are not toys; captive care needs species-specific husbandry.
Further reading
See the full Blue Tang profile for FAQs, taxonomy, and related guides on this site.
Appearance and defense
The blue tang's brilliant blue body is marked with a bold black pattern and a bright yellow tail. Like all surgeonfish, it has a sharp, blade-like spine on each side of the tail base that it can flick out to slash at attackers or rivals. When threatened, it may also play dead by lying on its side.
Diet and feeding
Blue tangs feed mainly on algae growing on the reef, grazing throughout the day. By keeping algae in check, they help corals get the light and space they need to grow, making tangs important to reef health. They also take plankton from the water when it is plentiful.
Habitat and behavior
Blue tangs live on coral reefs across the Indo-Pacific, from East Africa to Japan and the Great Barrier Reef. Juveniles often shelter among branching corals, while adults form loose groups in open water above the reef. They rely on the reef both for food and for hiding places from predators.
As an aquarium fish
Blue tangs are popular saltwater aquarium fish, and their fame from animated films increased demand. They are difficult to breed in captivity, so many are still taken from the wild, which raises concerns about reef collection. The species is listed as Least Concern overall, but responsible sourcing matters for healthy reefs.
Research notes
Figures for blue tangs (Paracanthurus hepatus) come from field studies, museum records, and conservation assessments that do not always agree on exact averages. Prefer ranges over single-point claims, and check whether a source describes wild, captive, or mixed populations.
Practical takeaways
If you encounter blue tangs in the wild, prioritise distance and local guidance. If you care for related domestic or captive animals, match diet and housing to species needs rather than generic pet advice. Share accurate status information (Least Concern) when discussing conservation.
Sources
FAQs
Blue Tang: Key Facts & Natural History?
The blue tang is a vivid royal-blue reef fish with a yellow tail, best known as Dory from the films Finding Nemo and Finding Dory. It lives on coral reefs across the Indo-Pacific, where it feeds mainly on algae and helps keep reefs healthy. Like other surgeonfish, it carries a sharp, scalpel-like spine near its tail that it uses for defense.
What is the scientific name of the blue tang?
Paracanthurus hepatus
What do blue tangs eat?
Omnivore (mostly algae)
Where do blue tangs live?
Indo-Pacific coral reefs
Are blue tangs endangered?
Listed here as Least Concern. Check IUCN and national lists for the latest assessment.