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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.

Echidna nebulosa, snowflake moray, Norfolk Island

A smooth and slippery echidna

December 10, 2024

If you are a trivia nut, you’ll like this one!

Here on Norfolk Island, I do a Reef Brief each Monday, where I talk about Norfolk Island’s reef, the connectedness of ecosystems and the critters that live there. And I often get asked some fascinating questions, some of which I have to take on notice. One such, which has been asked a couple of times now, is this:

How did the snowflake moray get its proper (scientific) name Echidna nebulosa, and what does it have to do with Australia’s famous and iconic marsupial, the echidna?

Excellent question. I had no idea. So I did a bit of research to find the answer.

In Greek mythology, Echidna was a half-woman, half-snake monster who lived along in a cave. In other words, a bit of this and a bit of that. You can read more about her on a comprehensive Wikipedia page on the topic.

Which is why, in 1797, Baron Georges Cuvier suggested this name for the echidna marsupial to reflect its combined mammalian and reptilian characteristics. However, predating Cuvier’s naming of the echidna, in 1789, the snowflake moray had already snagged the scientific name, Echidna (genus) nebulosa (species) had already snagged the scientific name of Echidna. Consequently, Cuvier’s name was relegated to being the marsupial echidna’s common, or generic, name. So, for example, the short-beaked echidna, which is found in Austalia, is known as the Tachyglossus aculeatus.

But returning to the snowflake moray: it is one of 11 species of moray in the Echidna family, presumably so named to reflect its snake-like qualities. It goes by several other common names, including Bosch’s reef-eel, clouded eel, clouded moray, clouded reef eel and starry eel.

To complicate matters further, there is the Atractus echidna (genus + species), a fairly recently recognised species of snake, where the species name of Echidna refers to its contrasting anterior/posterior colouration pattern, referencing Echidna of Greek mythology’s hybrid nature (which makes sense).

So there you go!

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In Fish, Fish species Tags Moray, Eel, Fish, Taxonomy, Echidna
← A year in review – 2024 on Norfolk Island’s ReefFeisty zingers! Focus on the 'brain' coral, Paragoniastrea spp. →
Featured
Reef relief
Jul 28, 2025
Reef relief
Jul 28, 2025

Today, 28 July, is World Nature Conservation Day. After the dry 2024, Norfolk Island’s reef is looking healthier – a brief reprieve as less water - laden with nutrients - flowed into the lagoon. These photos show what’s possible. It’s a reminder that recovery is within reach – though renewed runoff could quickly undo the gains.

Jul 28, 2025
Emily Bay's big 'brain' coral
Jul 20, 2025
Emily Bay's big 'brain' coral
Jul 20, 2025

In Emily Bay, Norfolk Island, a single coral bommie – Paragoniastrea australensis – has stood for decades as a micro-reef, harbouring diverse marine life and local memories. Once photographed in 1988 and still thriving today, it remains a keystone of reef biodiversity and a living link between past and present.

Jul 20, 2025
Biodiversity matters
Jul 14, 2025
Biodiversity matters
Jul 14, 2025

Over five and a half years of snorkelling Norfolk’s lagoon, we’ve documented 23 fish species not previously recorded in this area. Some are local ghosts, others climate migrants. These observations help us understand and protect what makes our reef so special.

Jul 14, 2025
Poop power
Jun 17, 2025
Poop power
Jun 17, 2025

Not all poop on a reef is bad poop. In fact some kinds of poop can be a reef’s most important invisible engine. Fish poop, bird poop – even poop that gets eaten again by other fish – all of it keeps the ecosystem ticking over in a way that’s nothing short of extraordinary.

Jun 17, 2025
Glimpses of recovery: what the reef could be if we let it
Jun 13, 2025
Glimpses of recovery: what the reef could be if we let it
Jun 13, 2025

Day 6 of this photo series from Norfolk Island coincides with the final day of the UN Ocean Conference in Nice. After a week of documenting decline, today’s post offers a different view – what reef recovery can look like when conditions improve. Drought in 2024 gave the reef a break, and the results were unmistakable: healthier corals, lower disease, and more fish. This is what’s possible if we act.

Jun 13, 2025
Warning signs: quiet and unnoticed collapse of two coral colonies
Jun 12, 2025
Warning signs: quiet and unnoticed collapse of two coral colonies
Jun 12, 2025

Day 5 of my blog series for the UN Ocean Conference: two long-lived coral colonies in Norfolk’s lagoon died quietly from disease. No drama – just slow collapse and overgrowth by algae. A reminder that not all reef losses are loud, but they are happening.

Jun 12, 2025
Warning signs:  what Norfolk Island’s reef is telling us
Jun 11, 2025
Warning signs: what Norfolk Island’s reef is telling us
Jun 11, 2025

Day 4 of a week-long photo series from Norfolk Island, shared during the UN Ocean Conference in Nice. Today’s post spotlights a Hydnophora pilosa colony where white syndrome appeared suddenly and spread quickly, taking out around a quarter of the coral. In the months that followed, algae quietly filled the gap – a subtle but telling shift from coral to algae that’s happening across the reef.

Jun 11, 2025
Warning signs: coral disease takes hold
Jun 10, 2025
Warning signs: coral disease takes hold
Jun 10, 2025

In Day 3 of this blog post series, published while leaders gather at the UN Ocean Conference in Nice, we see Norfolk Island’s coral reef lagoon quietly delivering a stark warning: recurrent land-based pollution, coral disease, and delayed decisions are dismantling this ecosystem in real time.

Jun 10, 2025
Warning signs: coral growth anomalies – the slow cancers of the reef
Jun 9, 2025
Warning signs: coral growth anomalies – the slow cancers of the reef
Jun 9, 2025

Day 2’s post coinciding with the UN Ocean Conference looks at coral growth anomalies – sometimes called coral ‘cancers’. These slow-moving diseases quietly weaken coral colonies, making them far more vulnerable to storm damage and algal takeover. On Norfolk Island’s reef, I’ve watched this exact process play out over several years. This is how chronic stress silently dismantles coral ecosystems.

Jun 9, 2025
Warning signs: shifting baselines on Norfolk Island’s reef
Jun 8, 2025
Warning signs: shifting baselines on Norfolk Island’s reef
Jun 8, 2025

Today is World Ocean Day — a timely moment to launch my week-long blog series on Norfolk Island’s reef. Each day this week, I’ll be sharing photo essays that document the slow but steady pressures reshaping this fragile reef. Today: how shifting baselines make us blind to what we’ve already lost.

Jun 8, 2025

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