Julian Rocks, Byron Bay, northern New South Wales
Where to see leopard sharks in Australia
Julian Rocks off Byron Bay hosts what researchers describe as the largest known aggregation of Indo-Pacific leopard sharks in the world. Through the austral summer the East Australian Current pushes water past 23°C and the sharks arrive in numbers, with the Cape Byron Leopard Shark Project having photo-identified more than 400 individuals. It is a ten-minute boat ride to a nine to eighteen metre site, so the encounter is as easy to reach as it is dense.
Best time: December to April, peaking January to March
Well documented, and reliably seen in season.
When to go
Sources differ on the boundaries — some give January to March as the core, others December to April, and the project’s counts run December to May. January to March is the safe recommendation with December and April as shoulder months. The driver is water temperature above about 23°C, so the window shifts year to year.
Best dive sites for leopard sharks in Australia
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The Needles, Julian Rocks
Parallel rock ridges with wide sand alleys between them at roughly 9 to 15 metres — the preferred summer resting ground, often with several sharks at once.
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Hugo’s Trench and the sand gutters, Julian Rocks
Sandy channels on the same island, generally shallower and calmer, with the same drill.
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Cod Hole, Julian Rocks
A reef and cave feature rather than leopard shark ground, but worth the dive while you are on the site.
How to see them
The whole game here is the sand between the rock, not the rock. Guides fly the sand alleys at the Needles a metre or two off the bottom, and the sharks appear as tan slabs with a long tail, sometimes three or four in one gutter. Because there can be many, the temptation is to swim from one to the next — resist it, since each pass pushes animals off their spot. Hold a line down the middle of a gutter, keep your fins up and off the sand, and let the sharks be on either side of you rather than driving them ahead. Water runs 21 to 26°C in summer, so a 5 mm suit and decent buoyancy control are the entry requirements.
What an encounter is like
In peak summer this is one of the surest shark dives anywhere, with dozens on a good day. But it is genuinely seasonal: outside roughly December to April the sharks are largely absent and Julian Rocks becomes a temperate site with grey nurse sharks instead. Even within the season they come and go with water temperature, so a cold-water intrusion can empty the site for a week, and surface conditions off Byron can cancel days.
Frequently asked questions
- When is leopard shark season at Byron Bay?
- The austral summer, roughly December to April, peaking January to March. The sharks arrive when the East Australian Current pushes water temperatures past about 23°C.
- How many leopard sharks are at Julian Rocks?
- It is the largest known aggregation of the species, and the Cape Byron Leopard Shark Project has photo-identified over 400 individuals from their spot patterns.
- What is at Julian Rocks outside summer?
- The site turns temperate and grey nurse sharks become the draw, along with rays and turtles. The leopard sharks are largely absent until the water warms again.
Sources
- Diving Julian Rocks by Month — Sundive Byron Bay
- Spots and stripes: A closer look at leopard sharks — Oceanographic Magazine