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David Charash Named 2022 DAN/Rolex Diver of the Year

Dr. Charash is a board-certified emergency medicine and undersea and hyperbaric medicine physician who has been caring for injured divers since 1993.

Early in his career he recognized the need for quality education for both divers and those in the medical community who care for them. He has developed workshops, symposiums, lectures, and a podcast (Fitness in Diving) about dive medicine, safety, and technology.

Happy World Ocean Day

On World Ocean Day, people everywhere can unite to celebrate and take action for our shared blue planet, with one ocean and one climate, which connect us all. Get together with your family, community, and /or your company, and join with millions of others around our blue planet to create a better future.



By working together, we can -- and will -- protect and restore our shared ocean and climate. Join this growing global celebration in June and continue to grow the engagement year-round!

OZDive Show Tickets Now Open!

Online ticket sales are now live. For OZTek Advanced Diving Conference & OZDive Show general entry tickets, go to: OZDiveShow.com.au/Tickets

The official hotel is the Melbourne Pan Pacific.

If you want to book - we have a special set rate - please book directly online using THIS LINK.

Catch what's new:
OZDive Podcast, Facebook, Instagram & Twitter.

As well as websites:

If you have any questions, please reply to AskMe@DiveOZTek.com.au or contact Sue Crowe on +61 498 964 963.
A slow-moving filter-feeder, the gentle whale shark is the biggest fish in the sea.
A slow-moving filter-feeder, the gentle whale shark is the biggest fish in the sea.

Shipping poses substantial threat to whale sharks

As whale sharks assemble in coastal regions to spend substantial time in surface waters, experts theorised collisions with ships could be causing substantial whale shark deaths. Previously, there was no way of monitoring this threat.

Scientists from 50 international research institutions and universities tracked both whale shark and ship movements across the globe to pinpoint areas of risk and potential collisions. Satellite-tracked data from nearly 350 whale sharks was submitted to the Global Shark Movement Project, conducted by MBA researchers.

Giant manta ray. Photo by Scott Bennett
Giant manta ray

How big is it? Drones assisting in manta ray research

A global breakthrough in recording manta ray information has been made by an Auckland University doctoral candidate. In a study entitled “How Big Is That Manta Ray?” published in Drones, Edy Setyawan outlined how a drone camera, with the addition of a PVC pipe in the ocean, can be utilised to accurately measure the world’s largest ray species. “I could see that from the drone there was some size variation, some mantas, they are bigger than the others,” said Setyawan. “It’s quite cheap using a small drone, but it can give us a big impact on manta ray conservation.”

Breaching humpback whale
Breaching humpback whale (pixabay license)

Southern Hemisphere whale-call research highlights need for MPA network

The “whup” and “grumble” sounds recorded by hydrophones moored in the Vema Seamount in the Atlantic Ocean, 1,000km northwest of Cape Town in South Africa, suggest this location could be an important stop on the whales’ migration route to polar feeding grounds.

Most of the calls were recorded over a period of three nights in the spring of 2019, with low “whups” being heard most frequently. This is an important discovery as the “whup” is a contact call used by mother-calf pairs to help them locate each other. Furthermore, humpbacks also “whup” while feeding.