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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
Familiar faces – getting to know the reef’s residents
November 3, 2026
Familiar faces – getting to know the reef’s residents
November 3, 2026

Six years of swimming the same little reef have introduced me to some unforgettable characters that I’ve followed over time. From familiar fish and anemones to turtles and a snail’s eggs, this final article in my photographic series explores what I’ve learned about the lives of individual animals simply by returning, watching and taking photographs.

Read more →
November 3, 2026
When algae move in – the changing reef neighbourhood
November 1, 2026
When algae move in – the changing reef neighbourhood
November 1, 2026

Algae are a natural part of Norfolk Island's reef, changing with the underwater seasons. But sometimes their beautiful green growth conceals a rather sad story. In the fifth article of my six-part photographic series, I revisit familiar places to see how algae have changed over the years – and what might be hiding underneath.

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November 1, 2026
The slow disappearance – disease on the reef
October 30, 2026
The slow disappearance – disease on the reef
October 30, 2026

What happens after coral disease has run its course? In the fourth article of my six-part photographic series, I revisit colonies I've watched lose living tissue, sometimes alarmingly quickly. From a potentially century-old brain coral that lost most of its living tissue in less than 100 days to the algae-covered skeletons left years later, these photographs reveal the longer-term consequences of coral disease on Norfolk Island's reef.

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October 30, 2026
When storms rearrange the reef
October 28, 2026
When storms rearrange the reef
October 28, 2026

Sometimes the sea rearranges a reef in a matter of hours! In the third article of my six-part photographic series, I revisit corals broken, overturned or swept away by powerful swells and storm surges. Some disappeared altogether, while others found surprising ways to survive. Five photographic sequences reveal just how dramatically Norfolk Island's reef can change.

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October 28, 2026
When the reef fights back – coral growth and recovery
October 26, 2026
When the reef fights back – coral growth and recovery
October 26, 2026

Not every coral story ends badly! Among six years of underwater photographs are some wonderful examples of growth, survival and recovery. From corals that have grown spectacularly to others that have survived bleaching, breakage or even being turned upside down, this second article in my photographic series celebrates some of the reef's more encouraging stories.

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October 26, 2026
The neighbours – six years of watching the same reef
October 24, 2026
The neighbours – six years of watching the same reef
October 24, 2026

When I began photographing Norfolk Island's reef in 2020, I simply recorded whatever caught my eye. Six years later, those photographs have become a record of individual corals and their changing fortunes – growth, competition, survival and loss. This is the first of six articles looking back at what I've seen, and sometimes what I wish I hadn't.

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October 24, 2026
Pulling the rugosity from out of the reef
October 10, 2026
Pulling the rugosity from out of the reef
October 10, 2026

What do ‘rugosity’, structural complexity and channeling your inner fish have in common? Quite a lot, as it turns out. This week I’m looking at how all the lumps, bumps, branches, holes and ledges on a reef create habitat – with a brief detour into one of my long-standing tricks for navigating tertiary study: write down the jargon until it starts to make sense.

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October 10, 2026
How does a sea slug smell?
September 27, 2026
How does a sea slug smell?
September 27, 2026

It started with a close-up of a little Elysia and two rhinophores that looked like tiny rolled-up scrolls. Once I noticed them, I started going back through years of sea-slug photos and realised just how wildly different these sensory organs can be – ridged, rolled, curled, tubular and, in sea hares, distinctly rabbit-eared. So this week’s rabbit hole is all about how sea slugs ‘smell’ underwater, and why their noses come in so many different shapes.

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September 27, 2026
The Elite Fleet sails in
September 19, 2026
The Elite Fleet sails in
September 19, 2026

Nearly six years ago, my very first blog post was about the strange blue and violet creatures that live at the ocean’s surface – a group I christened Norfolk Island’s ‘Elite Fleet’. Since then I’ve seen plenty of bluebottles and the occasional violet sea snail, but never a by-the-wind sailor. Until this morning. Velella velella is not a true jellyfish, but a colonial hydrozoan with a transparent sail that lets the wind help carry it across the ocean. So what exactly is this extraordinary little creature, how does it ‘sail’, and what connects it to the rest of the fleet?

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September 19, 2026
In a nutshell – where I stand on the proposed Norfolk Island Marine Park
September 18, 2026
In a nutshell – where I stand on the proposed Norfolk Island Marine Park
September 18, 2026

I support the proposed expansion of Norfolk Marine Park and its renaming as Norfolk Island Marine Park. There is much to welcome – strong offshore protection, no mining, and recognition of the importance of sustainable local fishing. But I also have some reservations. Why does Cascade need to be removed from the Marine Park at all? How will more than 430,000 km² actually be monitored and enforced? How do we make sure Norfolk people have a genuine role in management? And, above all, how do we ensure that the enormous new park does not draw attention away from the small, stressed reef immediately beside us?

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September 18, 2026

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