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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.

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
Norfolk Island’s fishes: drifters, residents and the ones still missing
Mar 24, 2026
Norfolk Island’s fishes: drifters, residents and the ones still missing
Mar 24, 2026

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.

Mar 24, 2026
18 Jun 2025 (20)_crop.jpg
Mar 7, 2026
Alveopora or flowerpot coral – how to tell the difference
Mar 7, 2026

They look alike at first glance, but Alveopora and flowerpot corals are not the same. The easiest way to tell them apart is to count the tentacles.

Mar 7, 2026
Norfolk’s lagoonal reef – the 2025 report, in plain English
Feb 27, 2026
Norfolk’s lagoonal reef – the 2025 report, in plain English
Feb 27, 2026

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.

Feb 27, 2026
Halimeda’s night shift – why this reef algae changes colour
Feb 20, 2026
Halimeda’s night shift – why this reef algae changes colour
Feb 20, 2026

Halimeda is a calcareous green reef alga that forms new segments overnight, shifts from white to bright green by dawn, then pales again as calcification begins. A quick look at one of the reef’s smartest algae.

Feb 20, 2026
Reef real estate – a bubble-tip’s six-year stand-off
Jan 11, 2026
Reef real estate – a bubble-tip’s six-year stand-off
Jan 11, 2026

Reef space is finite, and nothing ‘shares’ it politely. This short photo essay follows one bubble-tip anemone on Norfolk Island’s lagoonal reef as it holds a crater surrounded by Montipora. The coral builds a rim; the anemone holds the centre. Six years apart, and the argument continues.

Jan 11, 2026
A year in review – 2025 on Norfolk Island's reef
Dec 28, 2025
A year in review – 2025 on Norfolk Island's reef
Dec 28, 2025

Norfolk Island’s reef in 2025 – a year in review. From NOAA bleaching alerts and the UN Ocean Conference ‘Warning Signs’ series to post-drought coral recovery and a wet winter revealed in long-term rainfall records, this post captures the wins, losses, and shifting baselines beneath the lagoon. Includes reef photos, highlights from Reef Relief, and standout stories from 2025 – from coral health and disease to boxfish biomimicry, sea urchins, nudibranchs, and heat-stress signals in anemones.

Dec 28, 2025
Herbicides, heritage, and an inshore reef: what happens when land management meets lagoon health
Dec 15, 2025
Herbicides, heritage, and an inshore reef: what happens when land management meets lagoon health
Dec 15, 2025

Herbicide use near Emily, Slaughter and Cemetery Bays raises questions about inshore reef health, heritage land management, and environmental protection on Norfolk Island.

Dec 15, 2025
Signs of bleaching – 8 December 2025
Dec 8, 2025
Signs of bleaching – 8 December 2025
Dec 8, 2025

I took these photographs this morning, Monday, 8 December 2025. A few warm days of settled weather, little cloud cover and low tides in the hottest part of the day have led to some early bleaching on our reef. Bleaching doesn’t always mean death for our corals, but it is concerning to have this so early in the summer season. Fingers crossed the conditions don’t last and the reef can recover.

Dec 8, 2025
Nature is my teacher
Dec 3, 2025
Nature is my teacher
Dec 3, 2025

This is a thank-you note. Five years after my first Out on a swim post – written with zero marine science quals and a head full of questions – I’m still in the water, now as a PhD candidate, because an extraordinary mix of locals, volunteers, researchers and public servants decided to share what they knew. This is the story of how nature – and a very patient community – became my teachers.

Dec 3, 2025
Reef grief: what dredging has done to other reefs
Nov 30, 2025
Reef grief: what dredging has done to other reefs
Nov 30, 2025

From Miami to Fiji, from Dubai to tiny village harbours on atolls, dredging near coral reefs has left a long trail of scars – even on ‘small’ projects. This follow-up to last week’s Kingston post walks through real examples of what happened elsewhere, and what that should make us think about before we dig up our own reef.

Nov 30, 2025

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