Viewing: April, 2018

Apr 22

April 22, 2018

The discovery of tiny Upside-down Jellyfish, Cassiopea ndrosia, in West Lakes

As a result of my first discovery of Upside-down Jellyfish, Cassiopea ndrosia, in December 2016 (The Upside-down Jellyfish, Cassiopea ndrosia ), I was able to recognize the species occurring in the hundreds when I dived in West Lakes in March 2018. I first saw a single tiny specimen: – I moved in to take a closer look: – A little... Read more

Posted in Cnidaria, Marine invertebrates | By

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

Posted in Sharks & Rays | By

Apr 4

April 4, 2018

The blanket octopus, Tremoctopus violaceus

Andrew Wright, General Manager for Calypso Star Charters, recently sent us some photos of what he thought was a blanket octopus that had swum into their shark viewing cage at the North Neptune Island marine park on Good Friday. (Click on the following images to enlarge them.) The octopus that swam into the shark viewing cage (Photo courtesy of Andrew... Read more

Posted in Cephalopods, Marine invertebrates, Molluscs | By