Stonewalling on Contradictory Results – Part 3: John Brewer Reef Fact Check


The Australian Institute of Marine Science (AIMS) have been tasked with reporting on the state of the corals and coral cover at the Great Barrier Reef. They surveyed John Brewer Reef by underwater manta tow in March 2022, made no mention of any coral bleaching in that report, and stated coral cover to be just 21.8%. There are no photographs.

That is how I began a blog post on 14th April 2022.

I included the chart from the March underwater survey in that blog post with the caption, AIMS have large ships to survey the corals, but they don’t employ professional underwater photographers who might show us the true state of the corals including at the reef crest where coral cover is often more than 80%.

The results from the March underwater survey at John Brewer Reef that does not record any evidence of coral bleaching.

I had dived John Brewer Reef earlier that week, on 10th and 12th April and I was so impressed with the reef – the colourful corals, the number of fish, and the extent of coral cover over much of the reef crest.

I was finding it difficult to reconcile what was in the AIMS report from their underwater survey with what I had observed.

Coral cover across much of the reef crest was more than 100%, as photographed on 10th April 2022 by Leonard Lim.

I found it impossible to reconcile what I had observed with the results of their aerial survey claiming major coral bleaching. The aerial survey was undertaken by Neil Cantin.

Neil Canton from AIMS was part of a team that flew over corals reefs, including John Brewer Reef, in March 2022 reporting many of the reefs as severely bleached. John Brewer Reef was marked down as 31 to 60% bleached.

The results from the aerial surveys, as reported in a series of social media posts by David Wachenfeld from the Great Barrier Reef Marine Park Authority (GBRMPA), generated worldwide media headlines suggesting that this coral reef (John Brewer Reef) was dead and dying.

Yet I had never seen a more colourful coral reef, and the fish were exquisite not to mention the white tipped reef shark, nudibranchs, sea anemones and so on.

Another photograph taken at John Brewer Reef on 10th April 2022, when the same coral reef was being reported around the world as dead and dying.

John Liston, the head of communications at AIMS, got in touch with me by way of a phone call on 19th April. He pointed out that there were photographs from the AIMS underwater survey, and that it was incorrect of me to suggest otherwise. I was subsequently provided with four underwater photographs none of which showed any coral bleaching.

During that, and subsequent communications with AIMS, I asked for clarification regarding the under-water survey that reported no bleaching and results from the aerial survey that reported up to 60% bleaching for this same reef for the same period – March 2022.

I also asked for photographic evidence of the bleaching from the aerial survey.

No clarifications or evidence of bleaching was ever forthcoming.

To be clear, the AIMS underwater survey of 6th March 2022 made no mention of bleaching in the corresponding report with chart. It is mandatory that any bleaching be reported as part of the survey process. Bleaching at this reef was reported in 2017.

The AIMS and GBRMPA aerial survey, also undertaken in March 2022, reported bleaching at John Brewer Reef to be in the order of 31 to 60% but provided no photographs or other evidence to support the claim.

I have requested interviews with Drs Neil Cantin (responsible for the aerial survey) and also Mike Emslie (responsible for the underwater survey) to discuss the discrepancies, but these interview requests have been repeatedly denied.

A faux fact check by Eiddwen Jeffery from RMIT University quotes Mike Emslie as stating that the most recently survey found coral bleaching to be ‘major to severe’. In fact, Dr Emslie’s official report from the underwater survey published online reports no bleaching.

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Results from underwater survey are here:
https://apps.aims.gov.au/reef-monitoring/reef/John%20Brewer%20Reef/manta

Results from aerial survey are here:
https://www.gbrmpa.gov.au/the-reef/reef-health

Nudibranchs are tiny creatures often found at coral reefs, including John Brewer Reef. These three photographs are of a nudibranch at Heron Island reef on 10th November 2021 by Leonard Lim. I was on that dive.

The feature photograph (very top) shows me in the water at John Brewer Reef on 10th July 2022.



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By GIL