Gansbaai, South Africa, is famous around the world for its sharks. While the great white shark may be the species that first put this small coastal town on the map, it is certainly not the only impressive predator found in these waters.
One of our favourite visitors is the bronze whaler shark (Carcharhinus brachyurus), affectionately known in South Africa as the “bronzie.”
These large, powerful sharks are observed around our shark cage diving vessel called Shark Team, giving guests an opportunity to see a very different member of Gansbaai’s remarkable shark community.
So, what makes the bronze whaler shark so special?
Bronze whaler sharks in the waters off Gansbaai, South Africa.
What is a Bronze Whaler Shark?
The bronze whaler, also called the copper shark or narrow-tooth shark, belongs to the requiem shark family, Carcharhinidae.
Its common name comes from the distinctive bronze-grey to olive colouring across the upper body. The underside is much lighter.
Like many shark species, this difference between the dark upper surface and pale underside provides countershading. Viewed from above, the shark’s darker back blends more effectively with the water below, while its lighter underside is less conspicuous when viewed against the brighter surface.
Bronze whalers have streamlined bodies, pointed fins and a relatively long snout. They can be difficult for an inexperienced observer to distinguish from other requiem sharks, but their narrow, hook-shaped upper teeth are one of the characteristics used to identify the species.
How Big Do Bronze Whaler Sharks Get?
Bronze whalers are large sharks.
They commonly reach several metres in length, with exceptional individuals reported at approximately 3.5 metres.
They are also relatively slow to mature. Research indicates that males may not reach sexual maturity until approximately 13–19 years of age. Females may mature at around 20 years.
This slow life history is important from a conservation perspective. Sharks that take many years to mature can be particularly vulnerable when fishing removes individuals from a population faster than they can reproduce.
Where Do Bronze Whaler Sharks Live?
Bronze whaler sharks have a widespread but patchy global distribution and are found in temperate and subtropical waters.
Populations occur around parts of:
- Southern Africa
- Australia
- New Zealand
- South America
They are highly mobile sharks and can occur both close to the coast and farther offshore.
Here in Gansbaai in the Western Cape, bronze whalers form an important part of the local marine ecosystem and are one of the many shark species we may encounter during our cage diving trips.
What Do Bronze Whaler Sharks Eat?
Bronze whalers are active predators with a varied diet.
Their prey includes schooling fish such as sardines and mullet, as well as squid, octopus, rays and smaller sharks.
Their feeding ecology also connects them with one of South Africa’s greatest natural spectacles: the Sardine Run.
Every year, enormous shoals of sardines move along South Africa’s coastline. Dolphins, whales, Cape fur seals, seabirds and numerous predatory fish are attracted to this abundance of food.
Bronze whaler sharks are among the top Apex predators that follow and feed on these vast sardine shoals.
It is one of the reasons bronzies feature so prominently in spectacular underwater footage of the South African Sardine Run.
How Do Bronze Whaler Sharks Find Their Prey?
Sharks possess an extraordinary sensory system called electroreception.
Around the head and snout are tiny sensory organs called the ampullae of Lorenzini. These allow sharks to detect weak electrical fields produced by living animals.
Every contraction of a muscle produces a tiny electrical signal. A shark can use this additional sense when searching for prey, including animals that may be partially hidden beneath sand.
Electroreception works alongside the shark’s other highly developed senses, including smell, vision and its ability to detect movement and vibrations in the surrounding water.
For anyone interested in marine biology, seeing a shark at close range provides a very different appreciation of just how specialised these animals are for life in the ocean.
Bronze Whaler Teeth
Another interesting feature of bronze whalers is their teeth.
The upper teeth are narrow, triangular and hook-shaped. There are also differences between adult males and females, known as sexual dimorphism.
Adult males can have longer and more strongly hooked upper teeth than females and juveniles.
These differences may relate to reproduction as well as feeding.
Do Bronze Whaler Sharks Have a Third Eyelid?
Yes. Bronze whalers possess a nictitating membrane, sometimes described as a third eyelid.
This tough membrane can move across the eye, helping protect it from injury, particularly during close encounters with prey.
It is a fascinating adaptation to observe because not every shark protects its eyes in the same way.
Bronze whaler shark showing its distinctive eye. Image captured by Ryan Cake, White Shark Projects volunteer.
Bronze whaler shark showing its distinctive eye. Image captured by Ryan Cake, White Shark Projects volunteer.
How Do Bronze Whaler Sharks Reproduce?
Bronze whalers give birth to live young.
They are placental viviparous, meaning embryos develop inside the female and receive nourishment through a placenta-like connection before being born as fully developed pups.
Females can give birth to multiple pups, and newborn bronze whalers are approximately 60 cm long.
Combined with their relatively late age at maturity, this reproductive strategy means populations can take time to recover when heavily exploited.
Why Do Bronze Whaler Sharks Breach?
Great whites aren’t the only sharks capable of launching themselves clear of the water.
Our team in Gansbaai has also observed bronze whaler sharks breaching.
Why they do it is much harder to answer.
Possible explanations for breaching behaviour in sharks can include feeding, communication or responses to other animals. Parasites have also been suggested as a possible reason for breaching in some marine species, although simply hitting the water may not be sufficient to remove them.
These unanswered questions are part of what makes observing wild sharks so fascinating.
Even after decades of shark research, there is still an enormous amount we have to learn about their behaviour.
Why Are Bronze Whaler Sharks Important?
Sharks play important ecological roles in marine food webs.
As predators, bronze whalers influence prey populations and form part of the complex relationships that keep marine ecosystems functioning.
They are also affected by human activity.
Bronze whalers are caught in commercial and recreational fisheries and can also be taken as bycatch. Their slow growth and relatively late maturity make responsible fisheries management particularly important.
Protecting sharks isn’t simply about protecting one charismatic animal. It is about understanding and protecting the wider marine ecosystems in which sharks live.
What Else Is a Bronze Whaler Shark Called?
Depending on where you are in the world, Carcharhinus brachyurus has several common names.
These include:
- Bronze whaler shark
- Bronzie
- Copper shark
- Narrowtooth shark
- Cocktail shark
- Cocktail whaler
In Afrikaans, another name for the species is koperhaai.
Whatever name you use, there is no mistaking the beautiful bronze sheen of one of these sharks when it passes close to the boat.
Can You Cage Dive With Bronze Whaler Sharks in Gansbaai?
Yes — bronze whaler sharks are one of the shark species that guests may encounter while shark cage diving with White Shark Projects in Gansbaai.
Because these are completely wild animals moving through a natural marine environment, no particular shark species can ever be guaranteed on a trip. That’s exactly what makes each launch different.
Depending on current conditions and shark activity, guests may have the opportunity to observe bronze whalers and other members of Gansbaai’s diverse marine ecosystem from the boat and from inside the cage.
A marine biologist accompanies our trips, giving guests the opportunity to learn about the sharks they encounter, their biology and behaviour, and the conservation work associated with these remarkable animals.
No previous diving experience or scuba qualification is necessary, and the required cage-diving and safety equipment is provided.
Meet Gansbaai’s Sharks for Yourself
Reading about the sensory systems, behaviour and ecology of a bronze whaler is fascinating.
Seeing one move through the water in front of you is something else entirely.
A shark cage diving trip in Gansbaai offers the opportunity to experience these predators in their natural environment while learning more about the biology and conservation of South Africa’s sharks.
Ready to meet Gansbaai’s sharks?
Book your Gansbaai shark cage diving experience with White Shark Projects and discover which of our wild shark species will be waiting beneath the surface.
www.whitesharkprojects.co.za/bookings/
Originally written by Georgina Vermeulen, Marine Biologist at White Shark Projects.
Originally published: 6 January 2020. Updated: 2026.
