Viewing: Sharks & Rays

Apr 4

April 4, 2018

The Removal of Shark Parasites

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 found confirmation of what I had seen on “Blue Planet... Read more

Posted in Bony fishes, Sharks & Rays | By

Apr 4

April 4, 2018

The Lifespan and Maximum Length of Grey Nurse Sharks

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 be four years old. This would mean that the shark... Read more

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Jan 15

January 15, 2018

More About Tropical Fish Cleaners (esp. re Manta Rays as hosts)

A couple of things this week have spurred me on to write a couple of additional things about “Tropical Fish Cleaners and Their Mimics”. It started with a photo of a Bluestreak cleaner wrasse, Labroides dimidiatus, cleaning in the mouth of a giant moray, Gymnothorax javanicus, in Egypt (the Red Sea) on The Global Diving Community Facebook page.  It had... Read more

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Dec 5

December 5, 2017

Port Jackson Shark Aggregations

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 Large numbers of Port Jackson Sharks, Heterodontus portusjacksoni, will congregate... Read more

Posted in Bony fishes, Sharks & Rays | By

Nov 16

November 16, 2017

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

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 shark culling policy in response to a number of human... Read more

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Aug 8

August 8, 2017

Jean and “Kitty” Whyte (Daughter of shark attack victim died exactly 77 years to the day later)

“Kitty” Whyte was SA’s first known shark attack victim. In March 1926, she had been giving swimming lessons to some children at Brighton jetty when she was attacked by a 3-4m shark She was subsequently rescued by two men in a boat, but she apparently died on the beach.  I previously documented Kitty’s death in two past MLSSA Newsletter issues... Read more

Posted in Achievements, Sharks & Rays | By

Jun 12

June 12, 2017

Shovelnose Stingarees

Fish identification can be tricky at the best of times. Then there are often new species that were not included in the old fish books. And the scientific names of species are often changing, and even changing back again. I recently revisited my 2016 article titled “Same Ray Seen Two Months Apart” (It can be found at http://mlssa.org.au/2016/01/09/same-ray-seen-two-months-apart/). It was... Read more

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Jan 9

January 9, 2016

Same Ray Seen Two Months Apart

I believe that I saw the same stingray (or stingaree) at Port Noarlunga reef on two separate dives two months apart. During my dive there on 7th November 2015, I took these photos of a ray just right of the jetty:- It seemed to me that part of the ray’s tail was missing. Two months later, on 6th January 2016,... Read more

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Jul 17

July 17, 2015

Second Valley update

Spearfishing There is a spearfishing restriction at “Second Valley Bay”. It has been in place for over 23 years now. The restriction is listed in the “South Australian Recreational Fishing Guide” under “General Fishing Information/Fish Spear/Hand Spear/Powerheads”. It is also listed at http://pir.sa.gov.au/fishing/fishing_gear/permitted_devices . Signage at Second Valley in 2009 (Taken by Steve Reynolds) As I wrote in my blog... Read more

Posted in Jetties, Marine Protected Areas, Maritime History, Regulation, Sharks & Rays | By

Apr 10

April 10, 2015

White shark by Terry Goss

Submission to SA Government re: shark cage diving locations in South Australia

To whom it may concern, Please accept this submission as our official response to the announcement that alternative sites are to be investigated for the redistribution of shark cage diving tourism. We understand that the proposed redistribution follows the absence of sharks from long established sites near the Neptune Islands, a phenomenon possibly caused by an orca attack, witnessed by... Read more

Posted in Climate change, Regulation, Sharks & Rays | By