SHARKS SEEK SAFETY IN SUBMARINE VOLCANOES

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SHARKS SEEK SAFETY IN SUBMARINE VOLCANOES by Steve Reynolds (STEVE’S SDFSA SCIENCE STORY for the month of September) According to Hordes of sharks found living in volcano by Raffaella Ciccarelli, reef and hammerhead sharks are thriving in the explosive crater of Kavachi volcano in the Solomon Islands. (Sharks have also […]

Raising Awareness About Shark Safe Behaviour and Alternatives to Baited Drum Lines and Shark Nets

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Raising Awareness About Shark Safe Behaviour and Alternatives to Baited Drum Lines and Shark Nets Tony Isaacson recently posted these details on his Facebook page: – “I flag this video in the wake of Category 4 (fatal) human-shark incidents in Queensland (spearfisher, Fraser Island) and NSW (surfer, Wooli). Both incidents […]

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 […]

The Removal of Shark Parasites

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I recently saw some film footage on an episode of David Attenborough’s “Blue Planet II” showing several silky sharks, Carcharhinus falciformis, seemingly scraping parasites off of a whale shark, Rhincodon typus. It occurred to me that this was a form of fish cleaning to add to my growing list. I […]

The Lifespan and Maximum Length of Grey Nurse Sharks

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According to the Facebook posting at https://www.facebook.com/FisheriesWA/photos/a.264218617326814.1073741827.246412385774104/486516945096979/?type=3&theater , a tagged 2.5 metre grey nurse shark, Carcharias taurus, caught by a recreational fisher in WA had been caught and released by Fisheries scientists 23 years earlier. Back in 1995, the shark was nearly 1.9 metres long and it was estimated to […]

Port Jackson Shark Aggregations

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Recent aggregations of Port Jackson sharks at both Port Noarlunga and Aldinga created much interest in this annual event. I was encouraged to review past articles that were published in our newsletters back in 2006. Our September 2006 newsletter included this article: – “Port Jackson Shark Congregations” by Steve Reynolds […]

Great, scalloped or smooth? How to identify a hammerhead shark

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As a South Australian snorkeler, typically drawn to shallow, inshore waters, I haven’t had first-hand contact with hammerhead sharks. As a child I found them fascinating; their distinctive T-shaped heads an apparent freak of evolution. In 2014 my interest in hammerhead sharks was renewed. That year, Western Australia introduced a […]