• Home
    • Norf'k Ilen's Language
    • Algae
    • Corals
    • Eels
    • Everything Else
    • Kingston, Norfolk Island
    • Nudibranchs, Sea Slugs and Flatworms
    • Octopuses
    • Out On A Swim Index
    • Reef Fish
    • Sharks
    • Sea Anemones
    • Sea Stars
    • Sea Urchins and Sea Cucumbers
    • Turtles
    • Underwater
    • Videos
  • Out on a swim - blog
  • About
  • Contact + Subscribe
Menu

Norfolk Island's Reef

Discover a fragile paradise – Norfolk Island's beaches, lagoons and coral reef
  • Home
  • Explore
    • Norf'k Ilen's Language
    • Algae
    • Corals
    • Eels
    • Everything Else
    • Kingston, Norfolk Island
    • Nudibranchs, Sea Slugs and Flatworms
    • Octopuses
    • Out On A Swim Index
    • Reef Fish
    • Sharks
    • Sea Anemones
    • Sea Stars
    • Sea Urchins and Sea Cucumbers
    • Turtles
    • Underwater
    • Videos
  • Out on a swim - blog
  • About
  • Contact + Subscribe

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.

No results found

Hornpike long tom - Strongylura leiurus

Citizen science: your observations can be powerful

January 7, 2023

Citizen science can be powerful. Let me explain why.

Sabre squirrelfish (Sargocentron spiniferum) spotted on 4 January 2023

In a recently released checklist of coastal fishes for Norfolk, Lord Howe and the Kermadec Islands, I was able to claim nine of the fish species from a (very) long list that are the first recorded sightings here on Norfolk Island. I must stress, that doesn’t mean that someone hasn’t seen these species here before, just that up until now they have either evaded being recorded by researchers and anyone else keen on cataloguing our wildlife; or maybe the person who saw them didn’t realise their significance; or they weren’t here in the first place and are new arrivals to the region.

It is such a buzz to find something different. Every time I go for a snorkel I wonder if I will see something new. Which is exactly what I did a couple of days ago; this time the sighting was of a sabre squirrelfish (Sargocentron spiniferum).

Why is it important to record these sightings?

Well, it matters not just from the perspective of establishing an ecosystem’s biodiversity, but also because, over time and looked at as a dataset, these observations can pick up trends, as I will explain.

I sent the details of my observation to Dr Malcolm Francis, Principal Scientist at the National Institute of Water and Atmospheric Research. He confirmed the fish’s identity and replied: ‘It is an interesting record – quite a bit further south than it usually is. From memory I’ve seen it in New Caledonia and Fiji.’

In the map of its distribution (taken from the Australian Museum’s website page for this fish) you can see the most southerly distribution previously recorded is about 750 km (give or take) further north than Norfolk Island.

The red dots show the sightings of the sabre squirrelfish (from the Australian Museum’s website). You can see Norfolk Island, almost centre, near the bottom

For example, thanks to these kinds of observations – often made by people just like you and me – RedMap (which stands for ‘Range Extension Database and Mapping Project’) has been able to produce a poster called ‘What’s on the Move Around Australia’. This poster (below), which records ten years’ of sightings from 2012 to 2022, graphically demonstrates that fish are responding to climate change by shifting their ranges further south.

We can’t be sure if our Norfolk Island sabre squirrelfish has simply been missed in previous recordings, because they are nocturnal, and quite shy, hiding under coral ledges during the day, or if it has shifted its range southwards because of warming oceans. For now, at least, we know it is here.

What's on the move around Australia. Click on the link to go to the site

Below are images of the other ‘first’ sightings that I’ve made for Norfolk Island. If you are a regular swimmer, some of these will seem so familiar that you may be surprised that they haven’t been recorded before, as I was. It just goes to show how important it is that we keep reporting sightings on pages like iNaturalist and Redmap, so that we have this important information available to interested researchers.

It only takes your observation of one little fish out of its previously understood ‘comfort zone’ to add to a body of evidence that may prove, or disprove, scientific theories, which may in turn then be used to inform government policy on a range of things, including climate change, preserving the environment, and much more.

That is citizen science at work. And it can be powerful and fulfilling.

View fullsize Banded sergeant - Abudefduf septemfasciatus
Banded sergeant - Abudefduf septemfasciatus
View fullsize Wartylip mullet - Crenimugil crenilabis
Wartylip mullet - Crenimugil crenilabis
View fullsize Marbled parrotfish - Leptoscarus vaigiensis
Marbled parrotfish - Leptoscarus vaigiensis
View fullsize Dot-and-dash Goatfish - Parupeneus barberinus
Dot-and-dash Goatfish - Parupeneus barberinus
View fullsize Bluebarred Parrotfish - Scarus ghobban
Bluebarred Parrotfish - Scarus ghobban
View fullsize Palenose parrotfish - Scarus psittacus
Palenose parrotfish - Scarus psittacus
View fullsize Yellowtail barracuda - Sphyraena flavicauda
Yellowtail barracuda - Sphyraena flavicauda
View fullsize Hornpike Long Tom - Strongylura leiurus
Hornpike Long Tom - Strongylura leiurus
View fullsize Dusky wrasse - Halichoeres marginatus
Dusky wrasse - Halichoeres marginatus
View fullsize Sabre squirrelfish - Sargocentron spiniferum
Sabre squirrelfish - Sargocentron spiniferum
← Doris – it takes a villageA Year in Review – 2022 on Norfolk Island's Reef →
Featured
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.

Read more →
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.

Read more →
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.

Read more →
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.

Read more →
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.

Read more →
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?

Read more →
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?

Read more →
September 18, 2026
No seagrass, but plenty of turtles
September 13, 2026
No seagrass, but plenty of turtles
September 13, 2026

Norfolk Island does not have seagrass, although one of our most conspicuous green algae is often mistaken for it. Feather and grape Caulerpa can both form striking patches across the lagoon. I take a closer look at what Caulerpa actually is, why it is so easily confused with seagrass, and where our green turtles fit into the story.

Read more →
September 13, 2026
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

Latest Posts

© 2026 All rights reserved.