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Norfolk Island's Reef

Discover a fragile paradise – Norfolk Island's beaches, lagoons and coral reef
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Out on A Swim

‘Out on a swim’ is a coral reef blog that tells the stories of the characters who live under the waves and what has caught my eye when ‘out on a swim’ in the lagoons of Norfolk Island. It is also a record of the difficulties Norfolk Island’s reef faces, like many others around the world, as a result of the poor water quality that has been allowed to flow onto it.

This page shows the most recent blog posts. For the complete catalogue, visit the ‘Out on a swim index’ page.

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Surge wrasse, Thalassoma purpureum, Norfolk Island

Meet George, the surge wrasse

March 13, 2024

Meet George, the surge wrasse. In fact, here on Norfolk Island, for some weird reason, they are all called George and have been for as long as I can remember. I’ve no idea why, but I do recall asking someone, many years ago, what kind of fish this purple, turquoise and pink guy was and I was told, ‘Oh, that is George!’ And so the name stuck!

George is also known as a green-blocked wrasse, purple wrasse or red and green wrasse, and more formally as a Thalassoma purpureum.

These guys are insanely, eye-achingly colourful, so I decided they were worthy of a photo dump on these pages. The Georginas can be seen towards the bottom of the photo gallery, and while more subtle in their colouration they are still very pretty.

Here are some quick facts about George and his relatives:

  • Surge wrasse are widespread, ranging from the southeast Atlantic, across the Indian Ocean and into the Pacific.

  • They love to hang out on rocky shores and coral reefs where there is plenty of heavy wave action.

  • The largest males can grow up to 46 cm in length and weigh about 1.2 kg.

  • George is a carnivore. He likes to eat sea urchins, crabs, molluscs, worms and other invertebates, and even small fish. You can see a surge wrasse feeding on fish in the video, ‘Lifecycle of the mouthbrooding Norfolk Cardinalfish, below.

  • They are protogynous hermaphrodite, in that females change sex to become males.

  • It is a pelagic spawner. The eggs and sperm are broadcast into the surface waters of the open ocean.

  • They are thought to live for ten years in the wild.

The surge wrasse’s protractile mouth juts outwards (Norfolk Island)

Surge wrasse are members of the wrasse family (Labridae) many of which are brightly coloured. I have noted 22 species of wrasse living inside our lagoons so far. If you include parrotfish (Scaridae), which are traditionally referred to as a separate family, but are now often treated as wrasse, there are an additional five species that I have recorded here.

Like many members of the wrasse family, they have protractile mouths, with separate jaw teeth that project forward, and fleshy lips.

References

  1. iNaturalist

  2. Wikipedia, Surge wrasse

  3. Wikipedia, Wrasse


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← Blasting a passage through the reef, Norfolk IslandNorfolk Island reef's autopsy reports →
Featured
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The lime-green coral in Slaughter Bay – a 40-year paper trail
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May 17, 2026

Green Mountain – the name I give this coral in my database – is a coral I’ve photographed for years as I swim past. Then I found its backstory in the Norfolk Island National Parks archives: a rough map, reused paper, a note in the margin – ‘still thriving’. That’s how baselines begin.

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What Norfolk Island’s reef tells us about environmental blind spots
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The Kingston dredging proposal on Norfolk Island raises a bigger question than dredging alone: how well do standard environmental assessment tools capture the real significance of a remote and unusual reef system like Norfolk Island’s?

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Hammer coral time!
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Norfolk Island’s fishes: drifters, residents and the ones still missing
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Norfolk Island’s fish fauna reflects both connection and isolation. Some species may arrive from elsewhere as drifting larvae, some populations appear to persist locally, and some fishes known from islands on either side of Norfolk have still not been recorded here. This post looks at what old survey work, regional checklists and genetic studies suggest about that more complicated picture.

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Norfolk’s lagoonal reef – the 2025 report, in plain English
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We now have the 2025 Norfolk Island reef health report, so I’m taking the opportunity to translate it into plain English here. Sadly, it’s more of the same story in Emily and Slaughter Bays – a reef that can cope with some stress, but is being asked to cope with too much, too often.

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