Recreational Fishing’s Possible Impact On Wrasses That Have Historically Helped To Limit Sea Urchin Densities

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Canopy algae are a major component of Blue Carbon fixation. Whilst diving at The Bluff (Rosetta Head) on 27th October 2022, I found this Western Pacific Purple Sea Urchin, Heliocidaris erythrogramma: – I have posted it on iNaturalist, along with the following details, at https://inaturalist.ala.org.au/observations/140727962 . Overall, I saw relatively […]

More on Sea Urchin Barrens and Mini-Barrens

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Further to my articles Sea urchin barrens and mini-barrens and Follow-up re Sea urchin barrens and mini-barrens, when Chris Roberts posted this photo of Red-tipped Urchins, Heliocidaris tuberculata, seen at Little Bay, New South Wales, on iNaturalist, David Muirhead commented, “looks like you have a problem with (urchin) barrens in […]

Species sighted at Witton Bluff & Christies Reef

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Species sighted at Witton Bluff & Christies Reef by Steve Reynolds As reported in My Early Diving Days , Witton Bluff is the high point on the coast between Port Noarlunga and Christies Beach. It is named after the 1839 wreck of the David Witton. I did my first sea snorkel there […]