‘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
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? Read on to find out more …
Read MoreIf corals had characters, then the Paragoniastrea spp. would be described as feisty, or even downright aggressive when it comes to asserting itself over its neighbours. They are also rather colourful.
Read MoreThis Acropora colony on Norfolk Island’s reef was photographed in 2021. Today it is no longer there. Weakened by disease, it was destroyed by a storm surge two years later, in December 2023
If disease were spreading through our native forests, if our trees were developing strange growths that hollowed them out, making them brittle in the face of each passing storm, would five years have slid by with the problem worsening by the day? That is exactly what is happening on Norfolk Island’s reef. Slowly, insidiously, it is dying and turning to slime.
Read MoreMontipora corals, Norfolk Island
Gorgeous, boring brown, Montipora corals! These beautiful coral colonies (and remember, these consist of loads of tiny little animals, which work together to create these amazing shapes) are one of our key reef-building corals. There are around 85 known species belonging to the Montipora genus.
Read MoreExtensive area of acropora coral affected by white syndrome on Norfolk Island’s reef
CSIRO are on Norfolk Island this week to present the findings of their report into water quality. As our Administrator, George Plant, says: ‘What the data shows us is that the quality of ground and surface water entering Emily and Slaughter Bays often contains high levels of contamination ... The health of the Emily and Slaughter Bay reef will continue to decline if we do not improve water quality.’
Read MoreOne of the first corals to catch my eye when I set out with my new camera in January 2020 was this stunning boulder coral that sits off the Salt House in Emily Bay. Regular swimmers would all be aware of its presence, but not many would realise that it is quite possibly an as-yet undescribed species of coral, which for the moment is known as Lobophyllia recta sensu Veron.
Read MoreA juvenile Hawksbill sea turtle, Eretmochelys imbricata, inside Emily Bay lagoon, Norfolk Island, listed as critically endangered, according to the IUCN Red List, and vulnerable under the EPBC Act
Today's National Threatened Species Day post discusses the conundrum of Australia's threatened species list and the IUCN Red List as they relate to vulnerable and threatened species here on Norfolk Island in the Marine Park. How, for example, do we offer protections to something that hasn't been formally identified yet, let alone listed as threatened?
Read MoreThe channel flowing into Emily Bay, Norfolk Island, 1pm on 20 July 2024
Four years ago, we had what amounted to nothing short of an environmental catastrophe in our lagoons. In the intervening years we have had numerous reports commissioned and delivered, and I have written plenty of blog posts about our poor water quality. Three weeks ago, on 20 July 2024, it all happened again. In this post, I explain exactly what occurred. Groundhog Day in Emily Bay, Norfolk Island.
Read MoreGreen moon wrasse, Norfolk Island, 17 July 2024
I’ve been photographing this guy, a green moon wrasse, since 2020, when he was a young adult just transitioning from being a female to a male. Green moon wrasse are said to live five to seven years in the wild, which means that our lovely old friend here could well be classified as an elder. This post is dedicated to this cheeky and inquisitive fish, the boss!
Read MoreThe Emily Bay’s massive ‘brain’ coral, Paragoniastrea australensis, photographed on 6 July 2024
This massive and incredibly slow-growing Paragoniastrea australensis sits in Emily Bay on Norfolk Island and is one of our most recognisable bommies. While all looks reasonably calm during the day, at night, while you are sleeping, the surface of the coral colony seethes with millions of tiny tentacles busily reaching out to find food, while others aggressively ward off opportunistic interlopers.
Read MoreMale birdnose wrasse, Gomphosus varius, Norfolk Island
All birdnose wrasses are born female but will change to males if the conditions are right. Its appearance changes radically throughout is lifecycle, from when it is a juvenile, through to being a female and then finally to being a male (known as sexual metamorphosis, or sequential hermaphroditism). For about three weeks you can see that transition taking place in the sequence of photos in this blog.
Read MoreThe mesmerising maze of the Paragoniastrea australensis
Paragoniastrea australensis is an incredibly slow growing species of coral. The colony featured in this post is probably 100 years old. When disease took hold in January 2024, it was gone, dead, in less than 100 days. Now it is a skeleton overgrown with algae. The worst part of this sad story is that it is our fault it died.
Read MoreBlue-barred parrotfish (Scarus ghobban), last seen in September 2021
In my ‘Year in review for 2023 on Norfolk Island’s reef’, published in December 2023, I made a few observations about the apparent disappearance of some fish species from Norfolk Island’s lagoons. I thought I would revisit these, principally because since December there has been so much additional fish activity here, with some exciting population increases and a few new species turning up.
Read MoreThe view across Emily Bay and Slaughter Bay’s contiguous reef at low tide. Quintal’s Passage can be seen as two parrallel lines of rocks. It runs from Emily out to sea.
We have shaped Kingston, Norfolk Island, to suit our own ends, whether it is by draining the swamp, undertaking major earthworks, or by using it for agriculture and grazing. Our interventions have placed the reef at risk. But simultaneously, the confluence of human activity and a unique natural environment have created a place of incredible significance, which deserves some special management to preserve all its facets.
Read MoreSurge wrasse, Thalassoma purpureum, Norfolk Island
George is a surge wrasse, also known as a green-blocked wrasse, purple wrasse or red and green wrasse, and more formally as a Thalassoma purpureum. All Norfolk Island’s lagoon-dwelling surge wrasses are referred to as ‘George’. These guys are insanely, eye-achingly colourful, so I decided they were worthy of a photo dump on these pages.
Read MoreHigh tide and pounding waves on Norfolk Island’s coral lagoon, southern shore, looking east towards Point Hunter
More reports to add to a long catalogue of reports were delivered to the general public over the last few days on Norfolk Island’s water quality and reef health. Reassuringly, they all say the same thing. Our poor water quality is affecting the health of our reef. So the science must be good! So when are we going to do something about it?
Read MoreGreen moon wrasse, Emily Bay, Norfolk Island
Do fish have eyes that move independently? Well, no, not really, but, yes, sort of, in some species, sometimes!
Read on for a brief ‘Fish eyes 101’ summary of how they work.
Read MoreA territorial banded scalyfin, Parma polylepis (aatuti), Norfolk Island
The banded scalyfins and the multispine damselfish are arguably two of the most common species in Norfolk Island’s lagoons. People often confuse them, particularly the juveniles, so here are some photos to clarify which are which. Once the differences have been pointed out, you’ll never confuse them again.
Read MoreIs this Atramentous Necrosis? This January, examples of this disease are popping up across Emily Bay on Norfolk Island
This month, I have increasingly noticed a disease that is presenting differently to the white syndrome that we have sadly become used to seeing. With this disease the coral goes grey-ish black and sometimes looks like it is almost dissolving or melting away. The result is a tragedy for the coral. I talk to coral health researcher Associate Professor Tracy Ainsworth about what is going on.
Read MoreSusan's flatworm, Pseudoceros susanae, Norfolk Island
Sharing knowledge is a fundamental aspect of human interaction that enriches both the giver and the receiver. Sharing and documenting knowledge ensures that valuable information and experiences are not lost but are instead preserved for future generations. So that is why I share.
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