“The barracuda hangs motionless in the current, watching everything with that cold silver eye. This is not a fish that worries about being watched.”
Barracuda of the Great Barrier Reef – Silver Predator of the Reef Edge
Barracuda are among the most dramatic and recognisable fish encountered on the Great Barrier Reef. Long, silver-bodied, and built for speed, they have a presence that commands attention — and a reputation that tends to run ahead of them. The reality, as divers and snorkellers quickly discover, is that barracuda are generally uninterested in humans and far more concerned with the small schooling fish they hunt.
Great Barracuda on the Reef
The largest barracuda on the Great Barrier Reef is the Great Barracuda (Sphyraena barracuda), which can reach up to 2 metres in length. They’re often found hovering alone in open water near drop-offs and current channels, using their position to survey the reef below for prey.
Chevron Barracuda — a smaller schooling species — form spectacular aggregations on some reef walls, creating shimmering silver tornadoes that rotate in the current. These schools are one of the Great Barrier Reef’s most memorable spectacles.
Are Barracuda Dangerous?
Barracuda have a fearsome reputation that is largely undeserved in recreational diving contexts. Unprovoked attacks on divers and snorkellers are extremely rare. Most encounters involve the fish simply holding its position and watching with apparent indifference.
That said, barracuda are thought to be attracted to shiny, reflective objects — so wearing jewellery or shiny dive equipment near them is not recommended. They are also ambush predators and can move with extraordinary speed when striking at prey.
Quick Facts About Barracuda
- Scientific name: genus Sphyraena (family Sphyraenidae)
- Also known as: sea pike
- Found in: coral reefs, lagoons and open water near reef edges; young Great Barracuda shelter in mangroves and estuaries
- Diet: mainly smaller fish and squid
- Size: the Great Barracuda reaches up to 2 m and about 50 kg
- Lifespan: the oldest Great Barracuda recorded was 18 years old
- Best chance of sighting: Great Barracuda alone near drop-offs; Blackfin (Chevron) Barracuda in large, slow-moving schools near current-swept reefs during the day
Scientific Classification
- Kingdom: Animalia
- Phylum: Chordata
- Class: Actinopterygii (ray-finned fishes)
- Order: Perciformes
- Family: Sphyraenidae (barracudas)
- Genus: Sphyraena
- Conservation status: the reef species are listed as Least Concern (IUCN)
Common Names
- Primary common name: Barracuda
- Other names: sea pike; the Great Barracuda is also called the Giant Barracuda
Barracuda of the Great Barrier Reef
- Great Barracuda (Sphyraena barracuda)
- Blackfin Barracuda, also called Chevron Barracuda (Sphyraena qenie)
- Pickhandle Barracuda (Sphyraena jello)
- Striped Barracuda (Sphyraena obtusata)
Identification Notes
Barracuda have long, silvery bodies, pointed snouts and a jutting lower jaw full of sharp teeth. The Great Barracuda has dark slanting bars on its upper sides and a black tail with white tips; the Blackfin Barracuda has a mostly black tail, and the Pickhandle Barracuda has chevron-shaped bars and a yellow tail.
Role on the Reef
Barracuda are fast predators that hunt smaller fish and squid using surprise and short bursts of speed. Attacks on people are rare. Large barracuda can carry ciguatera, a toxin that builds up in big reef fish, so Queensland Health advises avoiding eating large reef fish such as barracuda.
Learning about reef fish in class? We help schools, universities and study groups plan educational trips to the Great Barrier Reef. Depending on the program, groups can enjoy guided snorkelling and marine biology presentations.
Great Barrier Reef Educational Groups →
Where to See Barracuda
Barracuda are found throughout the Great Barrier Reef, particularly on outer reef walls and current-exposed reef edges where they can position themselves for hunting. They’re commonly spotted on dive and snorkel sites near Cairns, Port Douglas, and the Whitsundays.
A Hot Getaways destination. Where Care is Our Compass.
FAQs
Are barracuda dangerous to divers and snorkellers?
How do you identify a barracuda?
Where can I see barracuda on the Great Barrier Reef?
Why do barracuda sometimes follow divers?
How should I behave if I see a barracuda?
