BLACK JACK REEF - Goat Island & Hauraki Gulf

We've always had a soft spot for Black Jack Reef, despite its reputation for being a bit… spiky. Sure, the kina have done a number on some parts of the reef, leaving behind those tell-tale barren patches, but if you look past that, there's still plenty to explore. The maximum depth of 13 meters makes it a relaxed dive, and we often find ourselves lingering, scanning the nooks and crannies. Visibility averages around 4 meters, which means you're really getting up close and personal with the details. This isn't a site for grand vistas; it's a treasure hunt for the smaller stuff. We love spotting the nudibranchs – they're everywhere if you know where to look, a real highlight here. And keep an eye out for New Zealand sole camouflaged on the sandy patches, or a Spotted Stargazer peeking out. The currents can get a bit punchy sometimes, which is exactly why the kahawai hang out here. If you're into macro life and don't mind a bit of a hunt, Black Jack Reef offers a rewarding dive, perfect for photographers or anyone who appreciates the little things.

Location
Goat Island & Hauraki Gulf, New Zealand, Australasia
Coordinates
-36.709800, 175.733300
Type
reef

Marine Protected Area: Rabbit Island

Best Time to Dive in Goat Island & Hauraki Gulf

The warmest water temperatures in Goat Island & Hauraki Gulf occur in February, averaging 22.4°C. The coolest conditions are in August at 14.1°C.

Monthly Water Temperatures

  • January: 21.4°C
  • February: 22.4°C
  • March: 21.8°C
  • April: 19.8°C
  • May: 17.4°C
  • June: 15.3°C
  • July: 14.1°C
  • August: 14.1°C
  • September: 14.7°C
  • October: 16.3°C
  • November: 18.5°C
  • December: 20.3°C

Nearby Dive Sites in Goat Island & Hauraki Gulf

Nearest Dive Centres to BLACK JACK REEF

Marine Life in Goat Island & Hauraki Gulf

Home to 77 recorded species including 43 reef fish, 11 sharks & rays, 3 whales & dolphins, 3 crabs & lobsters, 3 other, 3 sea snails & nudibranchs.

Notable Species

Recommended Packing List for BLACK JACK REEF

Based on average water temperature of 18.0°C, currents 2 cm/s.

  • Wetsuit (3-5mm) - comfortable for 18°C water
  • Mask - essential for every dive
  • Fins
  • BCD - buoyancy compensator
  • Regulator - your most safety-critical piece of gear
  • Dive Computer - tracks depth, time, and NDL
  • Surface Marker Buoy (SMB) - essential for boat pickups
  • Dive Torch - useful for crevices and colour at depth
  • Underwater Camera - capture your diving memories