• Home
    • 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
    • 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.

Black Blenny, Enchelyurus ater found in Slaughter Bay, Norfolk Island

Black Blenny - a new record for Norfolk Island

March 25, 2023

DAY 25 – MARCH FOCUS ON NORFOLK ISLAND’S REEF

Today’s post is to highlight how little we still know about Norfolk Island’s reef.

Below is a copy of the Australian Fishes journal post about new fish sightings on Norfolk Island. You can find the original post here: Black Blenny - a new record for Norfolk Island


Author: Mark McGrouther, Senior Fellow at the Australian Museum.

This small fish in the image above was photographed by Susan Prior (@susanprior) in Slaughter Bay, Norfolk Island. Susan couldn’t identify the fish so she uploaded the observation identified simply as a ‘Ray-finned Fish’ to the Australasian Fishes Project.

Francois Libert (@francoislibert) subsequently correctly identified it to family, then Malcolm Francis (@francism) tentatively identified it as a Black Blenny, Enchelyurus ater. Malcolm tagged me for my input, so I referred the observation to Australian Museum Senior Fellow, Doug Hoese who confirmed Malcolm’s tentative identification.

Malcolm was particularly interested in Susan’s observation because for some years he has maintained a checklist of the coastal fishes of Lord Howe, Norfolk and Kermadec Islands. Malcolm noted that the Black Blenny had not previously been recorded from Norfolk Island.

This observation highlights the power of citizen scientists working with professional ichthyologists to achieve important outcomes. It also illustrates the fact that users shouldn’t be afraid to upload observations of fishes that they can’t identify. Most of the time someone will step up to the plate with an identification.

Thanks to everyone involved in bringing this new record to light.


Comments to the above post

Posted by francism: This is not Susan Prior's (@susanprior) first new fish record from Norfolk Island. In the past month alone she has recorded three new fish records for the island that I will be including the next time I update the checklist. A big thank you to Susan for her excellent observations! Thanks also to my Australian fish colleagues, Doug Hoese and Mark McGrouther (@markmcg) for their help with identification.

Susan's other recent new fish records are the sabre squirrelfish (Sargocentron spiniferum) and dusky wrasse (Halichoeres marginatus).

Posted by markmcg: Thanks for your excellent comment @francism.

Susan has made a terrific contribution to our knowledge of the fish fauna of Norfolk Island. She has found a total of eleven new fish records from the island (list below). For more details, see her blog post.

  • Banded sergeant - Abudefduf septemfasciatus

  • Wartylip mullet - Crenimugil crenilabis

  • Marbled parrotfish - Leptoscarus vaigiensis

  • Dot-and-dash Goatfish - Parupeneus barberinus

  • Bluebarred Parrotfish - Scarus ghobban

  • Palenose parrotfish - Scarus psittacus

  • Yellowtail barracuda - Sphyraena flavicauda

  • Hornpike Long Tom - Strongylura leiurus

  • Dusky wrasse - Halichoeres marginatus

  • Sabre squirrelfish - Sargocentron spiniferum

  • Black Blenny - Enchelyurus ater

In Fish species Tags black blenny, fish species, Fish, new species, Australasian Fishes project, Australian Museum
← For the sake of our grandchildrenDoris – just one turtle? →
Featured
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
The fate of a coral colony when it succumbs to white syndrome – four years on
Aug 24, 2025
The fate of a coral colony when it succumbs to white syndrome – four years on
Aug 24, 2025

I’ve tracked one plating Acropora coral from 2021 to 2025. In just a few weeks, white syndrome wiped it out. Nearly four years years on, it’s still smothered in algae and sea squirts, with only the tiniest hint of new growth. It’s a stark reminder: without tackling the root cause, we’re just watching the same sad story repeat itself.

Aug 24, 2025
The Candy-Striped Cleaner Keeping the Reef Healthy
Aug 17, 2025
The Candy-Striped Cleaner Keeping the Reef Healthy
Aug 17, 2025

Candy-cane stripes, long white feelers, and a reef spa on offer – the banded coral shrimp waves its antennae to advertise cleaning services to passing fish.

Aug 17, 2025
Biomimicry: How a Boxfish Caught Mercedes Benz’s Eye
Aug 10, 2025
Biomimicry: How a Boxfish Caught Mercedes Benz’s Eye
Aug 10, 2025

Meet Mr Lemonhead – our lagoon’s teeny yellow boxfish with a big design legacy. He inspired a Mercedes Benz concept car, proving how nature is full of surprises. And he shares the lagoon with other critters whose tricks have also shaped real-world inventions.

Aug 10, 2025
Patchwork Corals: How Colonies Fuse to Form Living Mosaics
Aug 3, 2025
Patchwork Corals: How Colonies Fuse to Form Living Mosaics
Aug 3, 2025

Some corals wear more than one colour for a reason. When Paragoniastrea australensis colonies fuse early in life, they form living mosaics. A beautiful reminder of coral cooperation on Norfolk Island’s reef.

Aug 3, 2025
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

Latest Posts

© 2025 All rights reserved.