‘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.
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A sea mat on the edge of the reef where the waves break, Norfolk Island
My March focus on Norfolk Island’s reef could almost go on for a full year, there’s so much to write about. But time dictates, so I will confine my efforts to one concentrated effort of randomness! Randomness, because there has been no plan to my posts. They have evolved as the month has progressed. Today I highlight two very different corals commonly seen, but not necessarily common.
Read MoreBubbles of oxygen forming on algae, photobombed by a tiny sea slug, sp, Elysia
March is often the warmest month on Norfolk Island’s reef, so it's no surprise that the algae are very busily photosynthesising and flourishing. Yesterday, I noticed that the algae had created a thick carpet of bubbles. As I swam my face was gently brushed by thousands of tingling bubbles, fizzing to the surface. It was quite a sight. And a rather weird sensation. So what is going on here?
Read MoreEmily Bay, Norfolk Island, #thecoloursarereal!
Looking across Emily Bay, do you wonder what is beneath the waves in there? Although this is not strictly part of Norfolk Island’s reef, it is part of one continuous ecosystem; therefore, in today’s March focus on Norfolk Island’s reef I thought it was worth showing you what you can see at your feet as you wade into the shallows.
Read MoreStunning Emily Bay, Norfolk Island.
In the 1960s we had reports voicing concerns around water quality, but nothing was done. When the Commonwealth of Australia’s EPBC Act came into force in 1999, nothing was done. Surely it is high time the issues of failing and inadequate infrastructure, deficient Norfolk Island laws and unsatisfactory protections were fixed once and for all?
Read MoreAcropora coral overgrown with algae, Norfolk Island
Today’s post for the March focus on Norfolk Island’s reef is a letter. Just that, and nothing more. The authors of this letter have very generously given me permission to reproduce it here. In it, Dr Kellie Pendoley and Dr Martin Goldsmith warn us about the future of Emily Bay. Written nearly eight years ago they give the coral reef habitat five to ten years before it is gone as we know it.
Read MoreThreadfin butterflyfish, Chaetodon auriga, Norfolk Island
Butterflyfish are flighty, brightly coloured and beautifully conspicuous on our coral reef in their bright yellows and oranges, white and black livery. On Norfolk Island we regularly see fourteen species, just a small portion of the more than 100 species, globally. Large numbers of butterflyfish are a good sign of a healthy reef.
Read MoreYellowstripe goatfish, Mulloidichthys flavolineatus
If you go for a snorkel on Norfolk Island’s reef, one family of fish that you are bound to see is members of the goatfish family. I have seen have six different species inside our lagoons. You can see them all here.
Read MoreAdult female elegant wrasse, Norfolk Island
It’s always fascinating to see how fish change in appearance as they mature. Today’s blog post features the elegant wrasse, Anampses elegans. But not only do they change how they look, they also change how they socialise and move about the reef.
Read MoreNorfolk Island blenny, Parablennius serratolineatus
It is fascinating to me that, in terms of biodiversity, there is still a slight feel of the frontier to Norfolk Island. So remote and isolated from any other land mass, it stands to reason that we have some different species that are found only here. On such is the Norfolk Island blenny.
Read MoreA bluestreak cleaner wrasse (Labroides dimidiatus) cleaning a coral sea gregory (Stegastes gascoynei)
Bluestreak cleaner wrasse, Labroides dimidiatus, are important critters on our coral reefs. These fish offer a swim-through full-body maintenance shop for other fish species – their clients – nibbling away dead skin and any nasty ectoparasites that might be living on their clients. There’s a lot to be learned about a reef from watching these busy little fish.
Read MoreLow tide at Cemetery Bay, Norfolk Island
No focus on Norfolk Island’s reef would be complete without a look at Cemetery Bay. It’s worth strolling along this beautiful beach at low tide. It is the island’s dog beach, so you will see plenty of locals out walking here, but better still is what you can see in the water – healthy corals happily growing right up to the beach.
Read MoreJust some of our beautiful corals on Norfolk Island
People say that Norfolk Island’s reef is rather boring and brown when compared to the Great Barrier Reef. While it may not be as colourful, I think you have to agree that it is anything but boring brown!
Read MoreHealthy montipora coral, Norfolk Island
Today’s focus on Norfolk Island’s reef is a photo essay. This series of photographs taken over the course of a year demonstrates how disease affects a montipora coral bommie by gradually killing the coral and creating an environment that allows algae to gain a foothold and to eventually take over.
Read MoreA common view of an aatuti as you swim into its territory!
One species that is doing remarkably well on Norfolk Island’s reef as it inexorably transitions from coral-dominated to algal-dominated is the banded scalyfin, Parma polylepis, which is unsurprising as their main food source is algae. The downside is they harass and bully all the other species that come anywhere near their territory, to the detriment of our biodiversity. Find out more here.
Read MoreTiny shells collected from the beach, Norfolk Island 1990s
On Norfolk Island, Australian Marine Parks recently issued a no-take area in our coral reef lagoon habitats. My hope is that with these bans in place, in addition to curbing runaway algal growth, there will be an improvement across the reef ecosystem in a number of different species, with subsequent knock effects for others, including for our molluscs, wrasse and octopus species.
Read MoreA peacock damselfish – Pomacentrus pavo
Today I am featuring a fish called the peacock damselfish – Pomacentrus pavo. On our tiny reef, you can often count the fish of a particular species on one hand, and the peacock damselfish is a perfect example of this. Our last baby peacock damselfishes appeared in mid-February (2021), but this year juvenile fish for any of the species in our bays have been hard to find. Maybe they are later this year?
Read MoreThe creek by the Salt House into Emily Bay
When Lt Philip Gidley King first arrived on Norfolk Island on 6 March 1788, the Kingston area was a swamp entangled in almost impenetrable vegetation. Chimney Hill created a natural stone barrier preventing water from draining into Emily Bay. In 1789, a channel was cut through the swamp, to the north of Chimney Hill and out into the bay. From this moment on the coral reef was compromised.
Read MoreA wayward scissortail sergeant (Abudefduf sexfasciatus)
Swimming has been with me all my life. It provides me with three wondrous things: time, space and connection. Time to myself. Time to contemplate, reflect, explore, see and watch. An endless, fathomless space where there is no one else but my own thoughts. And a connection with our natural world – something that is so important but so often not understood as being essential to our health and wellbeing. Read more here …
Read MoreFrom front to back: raccoon butterflyfish; blackback butterflyfish; three-striped butterflyfish Back right: Threadfin butterflyfish
Butterflyfish are ‘corallivores’, that is, they feed mainly on coral polyps and the energy-rich mucous that these produce. Corals also make a great place for butterflyfish to shelter in and under. Without healthy corals, then fish like these will become more and more scarce.
Read MoreThe black-mouthed tun snail as it clambered over the reef
When I took my first photographs of the live black-mouthed tun snail (Tonna melanostoma) and posted them on iNaturalist, I had no idea that there were no other – as in none, zip, nada – images of it in the public domain; just one of a broken shell that is housed in the Auckland Museum. This is my featured image for 3 March.
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