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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.

This blog is rated in the Top 20 Coral Reef Blogs in the world.

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Quality Row, Kingston, Norfolk Island, January 2025. The year began deep in drought.

A year in review – 2025 on Norfolk Island's reef

December 28, 2025

Since 2022, at the end of each year I’ve published a ‘Year in Review’ post – just to take stock of what’s happened under the waves: the wins, the losses and the changes. As I said back in 2023, documenting Norfolk Island’s reef on this website feels a bit like an insurance policy. These posts bear witness to what is happening, so we – and those who have the power to help – don’t ‘forget’ what we stand to lose.

For me, 2025 has been an extraordinarily busy year. I found my feet in my PhD studies, took on volunteer roles on various local advisory committees, and then started work experience at Norfolk Island National Parks in the second half of the year. And I managed to keep this website ticking over with new blog posts and updates to all the species pages.

View fullsize Healthy corals, early 2025
Healthy corals, early 2025
View fullsize 6 Nov 2025 (121)_reduced.jpg
View fullsize 23 Jul 2025 (134)_reduced.jpg
View fullsize 29 Sep 2024 (125)_reduced.jpg

We began 2025 with the National Oceanic and Atmospheric Administration (NOAA) Coral Reef Watch Satellite Bleaching Alert being raised from ‘watch’ to ‘warning’ in late January. You can sign up for these alerts, and at this time of year in this part of the world a lot of marine scientists watch them like hawks. Fortunately, we escaped the worst of it this time – although we weren’t so lucky back in 2024. If you want the detail, click here to see NOAA’s Norfolk Island bleaching stress maps (including what’s predicted for the coming weeks). By the end of January we should have a clearer picture of how we might fare with regards to bleaching this summer season.

By the end of April we were in the throes of a federal election campaign and I confess to venting my frustration in this post: The Governance–Government Vacuum: Norfolk Island’s Forgotten Ecology. Nothing much has changed since then. Our Norfolk Island’s governance is still a mess, democracy still eludes us, and consequently the federal government continues to kick the necessary governance changes – the kind that might actually protect Norfolk Island’s environment – down the road.

In that post, I reference John Wyndham’s book The Kraken Awakes:

Earth is invaded not through spectacular battles, but via a slow, almost imperceptible ecological catastrophe. The true focus of the novel is not alien monsters, but human failings: denial, political ineptitude, media distortion, and societal inertia.

The parallels to today’s environmental crises – climate change, biodiversity loss, ocean degradation – are chillingly clear. Early warnings are ignored because they are inconvenient. Scientific complexity is misrepresented or trivialised to appease audiences and protect interests. Public inertia reigns until disaster is irreversible.

In June, over six days, I wrote a series called ‘Warning Signs’ to coincide with the UN Ocean Conference held in Nice from 9–13 June. These included:

  • Warning signs: shifting baselines on Norfolk Island’s reef

  • Warning signs: coral growth anomalies – the slow cancers of the reef

  • Warning signs: coral disease takes hold

  • Warning signs: what Norfolk Island’s reef is telling us

  • Warning signs: quiet and unnoticed collapse of two coral colonies

But I finished that run on a note of cautious optimism with:

  • Glimpses of recovery: what the reef could be if we let it

There are plenty of other posts from 2025 to explore, and plenty of them are full of much better news. The drought of 2024 and early 2025 (which brought anxiety to residents relying on tank water) was, in an odd and uncomfortable way, a reprieve for the reef. Below is a diagram of 2025 rainfall plotted against the long-term monthly means (records here go back to 1891). The early part of this year, to my eyes, saw an amazing lift – corals looked healthier and seemed to be growing well – and it was a reminder of how resilient reefs can be when conditions ease off.

But as you’ll see from the rainfall pattern in the graph below, the rain returned in April and we ended up with a very wet winter indeed. With the wet, we seem to have had an uptick in coral disease. It will be interesting to confirm this, or not, when the coral health research reports are delivered in 2026.

Bureau of Meteorology, © Commonwealth of Australia. Licensed from the Commonwealth of Australia under a Creative Commons Attribution 4.0 International licence.

The yellow boxfish was inspiration for designers at Mercedes Benz

Because not everything has to be doom and gloom, one of my favourite posts this year was the one about biomimicry – and how a little yellow boxfish caught the eye of Mercedes Benz as possible design inspiration for a car: Biomimicry: How a Boxfish Caught Mercedes Benz’s Eye.

There were other fun (or interesting) posts scattered through the year too – including:

  • the nudibranch that looks like a 1970s sofa.

  • …glowing sea urchins.

  • …and a sea anemone that acts rather like a temperature barometer (a bit like corals do) by turning pale under heat stress as it loses its zooxanthellae, or symbiotic algae.

If you want some hope-in-photos, have a look through the images in Reef Relief.

A glowing Diadema sea urchin

Halgerday willeyi - 1970s retro!

For 2026, the biggest challenge for our reef is arguably the planned dredging project for Kingston’s Pier, which I write about here: To dredge or not to dredge? The Kingston Pier channel project. In this article I take a dispassionate look at what dredging can mean for Kingston’s coral reef. I followed it up with a quick look at dredging projects around the world and how they have fared: Reef grief: what dredging has done to other reefs.

I’m often asked why I keep posting – why I keep documenting, counting, photographing, and writing about what I see. Partly it’s because I’m fascinated. Partly it’s because I can’t unsee the changes once I’ve noticed them. And partly it’s because this reef is my daily place – it’s where I think, reset, and learn.

This year reminded me that reefs can be astonishingly resilient when they’re not being hammered from every direction at once. That’s a comforting thought – and also a confronting one, because it means some of the damage we accept as ‘normal’ is not inevitable. So I’ll keep doing what I can do – getting in the water, keeping records, putting the evidence somewhere public, and telling the story as honestly as I’m able.

In Ecosystem Tags corals, rainfall, Coral disease, drought, Norfolk Island, Review
← Reef real estate – a bubble-tip’s six-year stand-offHerbicides, heritage, and an inshore reef: what happens when land management meets lagoon health →
Featured
Watching El Niño from Norfolk Island
September 6, 2026
Watching El Niño from Norfolk Island
September 6, 2026

El Niño is strengthening across the Pacific, but that does not tell us exactly what the coming months will bring to Norfolk Island. After a long wet spell, I am watching our rainfall and water supplies more closely again – and, underwater, keeping an eye on sea temperature, algae, coral recruits and the fish that turn up on the reef.

Read more →
September 6, 2026
What the world’s reefs are telling Norfolk Island
September 2, 2026
What the world’s reefs are telling Norfolk Island
September 2, 2026

Two major new coral reef reports carry a clear message for Norfolk Island: reefs can recover when pressures ease, but the time available for recovery is shrinking. Norfolk Islanders were raising concerns about water quality, runoff and the health of Emily and Slaughter Bays nearly forty years ago. Today we have much better science, a changing climate and a far clearer understanding of how closely the catchment and reef are connected. This article looks at what that means for water quality, long-term monitoring, dredging and how we manage Kingston from land to sea.

Read more →
September 2, 2026
When the map changes
August 25, 2026
When the map changes
August 25, 2026

A fish once thought to belong only to Norfolk turns up elsewhere; another appears here hundreds of kilometres beyond its known range. Cardinalfishes and a Sabre squirrelfish show how our maps of species distributions are revised.

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August 25, 2026
Endemic, native, undescribed – what do these words actually mean?
August 24, 2026
Endemic, native, undescribed – what do these words actually mean?
August 24, 2026

A Norfolk chromis that turned out not to be Chromis fumea, a blenny found nowhere else, and a tiny goby that may not yet have a name. A look at what we mean by native, endemic, undescribed and newly described – and why scientific names sometimes change.

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August 24, 2026
What’s grazing in the green stuff?
August 16, 2026
What’s grazing in the green stuff?
August 16, 2026

A proliferation of Bryopsis on the reef has brought some beautiful little underwater grazers with it. I follow the trail from sap-sucking sea slugs and egg masses to a bigger question – why is there so much Bryopsis around at the moment?

Read more →
August 16, 2026
The clam beneath Emily Bay
August 8, 2026
The clam beneath Emily Bay
August 8, 2026

I’ve seen the beautiful shells of Laciolina chloroleuca in Emily Bay for decades, but I’d never really stopped to wonder where the living animals were. It turns out they may be buried half a metre beneath the sand. A closer look at an easily overlooked clam, its extraordinary shell markings, and the hidden life beneath our lagoon.

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August 8, 2026
Reflections of an accidental marine scientist
August 1, 2026
Reflections of an accidental marine scientist
August 1, 2026

What I thought would be a steady plod towards retirement, with plenty of time spent nursing grandchildren, was abruptly upended exactly six years ago today. This is the story of how an environmental catastrophe changed the course of my life – and led me to reinvent myself. It is a reflection on how, and why, I became an accidental marine scientist.

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August 1, 2026
From ridge to reef: unpicking the Waterway and Wetland Strategy
July 24, 2026
From ridge to reef: unpicking the Waterway and Wetland Strategy
July 24, 2026

Norfolk Island’s draft Waterway and Wetland Strategy will guide work for the next ten years. I support its intent, but it needs to be clear, practical and measurable – joining the dots from ridge to reef so we know whether public money is improving water quality and helping the reef.

Read more →
July 24, 2026
Reef reality in pictures
July 13, 2026
Reef reality in pictures
July 13, 2026

Let the pictures do the talking. This is the reality on Norfolk Island’s reef today, laid out in a two-minute video.

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July 13, 2026
The red seaweed behind low-methane beef
June 28, 2026
The red seaweed behind low-methane beef
June 28, 2026

A small red seaweed on Norfolk’s reef has become part of a much bigger story. Asparagopsis taxiformis can look like a delicate red feather duster or, at another stage of its life cycle, like a tiny cottony pom-pom. It is beautiful, easily overlooked, and now being used in the cattle industry to help reduce methane emissions. This post looks at the reef oddity behind the low-methane beef story – and why repeated local observation can be more useful than it first appears.

Read more →
June 28, 2026

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