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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.

A Norfolk Island endemic species, the Norfolk Island blenny, Parablennius serratolineatus

Atlas of Living Australia recognises iNaturalist observations for Norfolk Island

August 16, 2023

It may seem unimportant, irrelevant, or downright nit picky, but back in March 2022 I contacted the Atlas of Living Australia because I’d noticed an anomaly in their dataset feeds from iNaturalist.org. Let me explain.

As you may be aware if you read my Facebook page, I upload my observations to that platform in order to help me identify species and so we have a record of what is living here on Norfolk Island. iNaturalist is a global platform. Similar to iNaturalist, you can also upload your observations to the Atlas of Living Australia, which is the preeminent Australian platform. Now I don't know about you, but I don’t have the time or resources to be sitting here duplicating my uploads. However, very conveniently, ALA has a handy form that you can tick, which allows you to opt in and have your iNaturalist observations migrated across to the ALA, just like that. Easy peasy.

Except for here on Norfolk Island there seemed to be a roadblock, and our observations weren’t recognised as being from Australia.

Now putting politics aside about the status of Norfolk Island, why is it important that our observations are included in the ALA?

Because. Science + research. That’s all. As it says on the ALA website:

“Citizen science is becoming an increasingly significant and important contributor to the pool of data being used to create a more accurate picture of our biodiversity and ultimately advance scientific knowledge.”

...

“BioCollect fills a significant gap in data collection tools, supporting scientists wanting to engage the public in their research and the public wanting to participate in important scientific work, including collecting their own observation data.”

Which comes back to a question I often ask: how can you protect something when you don't know what it is? Well, you can't.

Which is why I fired off emails at semi-regular intervals to anyone I thought would listen.

Anyway, today, 16 August 2023, thanks to the wonderful people at the Australian Museum and at the ALA, citizen science data from the external territories of Australia, including Ashmore and Cartier Islands; Christmas Island; Cocos Keeling Island; Coral Sea Islands; Heard and McDonald Islands; and Norfolk Island have finally been included for anyone who opted in for this to happen. Needless to say, I am over the moon.

The photo above is of the Norfolk Island blenny, Parablennius serratolineatus, which, incidentally, is only found in a 20 km radius of Norfolk Island, so it’s a pretty special little guy. Moreover, I used to see these down at the pier end of Slaughter Bay all the time, but haven’t spotted any since February this year (2023), despite looking out for them any time I’m snorkelling at that end.

Cemetery Bay, Norfolk Island

In Biodiversity Tags Citizen science, iNaturalist, observations, Atlas of Living Australia, Australian Museum, biodiversity, endemic species, Environment, environmental protections, Environmental protection
← Brown? Yes. Boring? Definitely not!The clock is ticking for Norfolk Island’s reef →
Featured
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
To dredge or not to dredge? The Kingston Pier channel project
Nov 20, 2025
To dredge or not to dredge? The Kingston Pier channel project
Nov 20, 2025

How much risk are we really taking with the planned dredging at Kingston Pier – and how much protection do our corals actually have on paper? This piece walks through what the federal approval does and doesn’t guarantee, explains why sediment and light matter so much to the reef, and asks the hard questions we need answered before we trade a deeper channel for a shallower future.

Nov 20, 2025
A coral reef out of balance
Nov 8, 2025
A coral reef out of balance
Nov 8, 2025

After the long dry spell, the lagoon was crystal clear and full of life. But with the return of the rains, something else has returned too – the brown, filamentous mats of Lyngbya. It’s not seaweed, it’s a cyanobacterium, and when it takes hold it smothers coral and rubble alike. The reef’s way of showing us that every drop of water, from tank to tide, is connected.

Nov 8, 2025
Aglow among the spines
Oct 25, 2025
Aglow among the spines
Oct 25, 2025

Ever seen a sea urchin that seems to glow blue from the shadows? That’s Diadema savignyi showing off its reef shimmer. Beautiful, a little spiky, and definitely not to be messed with.

Oct 25, 2025
The funky seventies sea slug – Halgerda willeyi
Oct 15, 2025
The funky seventies sea slug – Halgerda willeyi
Oct 15, 2025

If ever a sea slug was channeling the 1970s, it’s Halgerda willeyi. With its groovy orange lines and chocolate-brown bumps, it looks straight out of a vintage lounge suite – the kind with shag pile carpet and bold floral cushions. Proof that nature was nailing retro design long before humans caught on.

Oct 15, 2025
Haddon's barometer
Oct 5, 2025
Haddon's barometer
Oct 5, 2025

This Haddon’s anemone has been quietly living in the middle of Norfolk Island’s Emily Bay for years, bleaching and recovering with the seasons. Like corals, sea anemones host microscopic algae that provide most of their food. When stressed by heat or rainfall changes, they lose colour – and tell a story about seasonal changes to the weather.

Oct 5, 2025
Honoured to be featured
Sep 30, 2025
Honoured to be featured
Sep 30, 2025

I left school in the UK nearly 50 years ago, so it was a pleasant surprise to be invited to share some images and take part in an interview for an article about my work, to be published in the annual glossy magazine the school now produces. Here is the end product.

Sep 30, 2025
Celebrating Biodiversity Month on Norfolk Island
Sep 7, 2025
Celebrating Biodiversity Month on Norfolk Island
Sep 7, 2025

September is Biodiversity Month – the perfect time to celebrate the astonishing variety of life on Norfolk Island’s reef. From new fish sightings to coral mosaics, every observation is a reminder of how much there is still to learn and protect.

Read more about why biodiversity matters, globally and right here in our lagoon.

Sep 7, 2025

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