The Nursery is the sheltered, western-facing quarter of Julian Rocks and is where almost every diver's first experience of this famous site begins. Protected from the swell and current that can make the eastern and southern sides more demanding, it is a shallow boulder-strewn reef in 5 to 12 metres, laced with overgrown anchors, small caves and a low bommie known locally as Split Bommie, all within Nguthungulli Julian Rocks Nature Reserve, one of the first marine sanctuary zones declared in NSW. What makes the Nursery remarkable is not its topography but its sheer density and diversity of life: this is the point where the warm, southward-flowing East Australian Current meets cooler temperate water pushing up from the south, and the result is one of the most fish-rich small dive sites in Australia, with well over 1,000 recorded marine species and upwards of 530 species of fish sharing the same few hundred square metres of reef.

On any given dive divers can expect green and loggerhead turtles resting under ledges, wobbegong sharks tucked into crevices, octopus and cuttlefish changing colour on the sand, colourful tropical reef fish alongside temperate species that would normally be found much further south, and — in season — leopard (zebra) sharks lying in the open sand patches through summer and grey nurse sharks moving onto the site in the cooler months. Because the depths are shallow and the site is largely current-free, the Nursery is used for open-water certification dives, refresher dives and snorkelling as much as for recreational diving, and it is also the default second or third dive of the day when swell makes the more exposed sites (Cod Hole, the Needles) unworkable. Visibility is the one unpredictable factor: it can be gin-clear at 15-20 m on a good day or reduced to 5 m within hours as the current shifts, which is part of what makes Julian Rocks such a dynamic site to revisit.

For a first ocean dive, a first shark or turtle encounter, or simply an easy relaxed dive between the more challenging sites at the rocks, the Nursery is hard to beat.

Both Byron Bay dive operators launch small rigid-hull inflatables directly off the beach: Sundive Byron Bay launches from The Pass at the northern end of Main Beach, and Byron Bay Dive Centre launches from the beach near the Wategos/Clarkes Beach end; check in first at the shopfront in town (Sundive: Shop 8, 9-11 Byron St; Byron Bay Dive Centre: Byron Plaza, 5/90-96 Jonson St), then walk down to the beach for the boat launch briefing. It is a short, often bumpy, beach-launch surf crossing before a 5-10 minute run out to Julian Rocks, so loose gear should be secured. No private-boat ramp serves the rocks directly; private boats normally launch from the Brunswick Heads river mouth or Ballina and run up or down the coast.

Julian Rocks sits fully exposed 2.5 km off Byron Bay, so conditions depend on the swell and wind direction rather than any tide window. Trips are cancelled or moved between the Nursery (sheltered west side) and the more exposed east/south sides depending on swell direction and size; a big easterly or south-easterly swell above about 2 m closes the outer sites but the Nursery can often still run. Visibility is genuinely tide- and current-driven here as warm East Australian Current water and cooler southern water meet around the rocks — it can change from 5 m to 20 m within a single day and even between two dives an hour apart.

Summer (Dec-Mar) is warmest (21-26°C) with the leopard shark aggregation and manta ray sightings; winter (Jun-Aug) is cooler (18-21°C) but usually clearer, with grey nurse sharks and migrating humpback whales visible from the boat. Heavy rain from the Brunswick and Belongil systems can dirty the inshore approach for a day or two but rarely affects the rocks themselves once you are out.

Descend on one of four moorings, spend the dive slowly working the boulder gardens at 5-10 m looking under ledges for wobbegongs and turtles, drift with any mild current toward the adjacent Needles if briefed to, and finish with an extended shallow safety stop over the boulders — an easy, low-stress profile suited to open water divers and course students.

Sundive Byron Bay (The Pass) – daily double and triple boat dives; Byron Bay Dive Centre (Wategos/Jonson St) – daily double boat dives, Mon & Thu-Sun.