SHARKS MUDDLE HUMANS WITH SEALS

Scuba divers might think it common knowledge that sharks bite humans because they confuse them with natural prey such as seals – but only now has this “mistaken identity” theory been confirmed.

In the first scientific study to be carried out on the topic, an international team created a virtual great white shark visual system to understand how the apex predators see the world.

At Sydney’s Taronga Zoo they obtained and compared video footage of seals and of humans swimming and paddling surfboards to predict what a juvenile shark sees when looking up from below.

“Until now, the potential similarity between humans and seals has been assessed based on human vision,” said lead author Dr Laura Ryan of Australia’s Macquarie University.

“However, white sharks have much lower visual acuity than us, meaning they cannot see fine details and lack colour vision. In these experiments, we were able to view the world through the eyes of a white shark.”

The juveniles proved unable to discriminate between the humans and seals above them. Younger white sharks less than 2.5m in length are responsible for a large proportion of bites on humans – at the stage of life at which their jaws are hardening to allow them to incorporate seals into their diet.

“They need to develop a search image for these prey items and combine that with other sensory information; it’s a learning process that could be prone to mistakes,” said Macquarie’s head of biological sciences Prof Nathan Hart.

Also involved in the study were the University of Exeter, La Trobe University, Oceans Research Institute, University of Western Australia, University of Bristol, Flinders University and New South Wales Department of Primary Industries.

“We confirm the plausibility of the mistaken identity theory from a visual perspective, but sharks can also detect prey using other sensory systems,” pointed out Dr Ryan. “While it seems unlikely that every bite on a human by white sharks is a result of mistaken identity, in circumstances where surface objects like surfers are targeted from below, it is very possible.”

Public uncertainty about the reason for shark attacks arouses concern that can lead to punitive shark-reduction measures, said Dr Ryan. “Greater understanding will hopefully lead to improved solutions that not only prevent shark-bites but also don’t needlessly endanger other marine wildlife.

“In fact, the findings of this study have inspired the design of non-invasive vision-based shark mitigation devices, which are currently being tested.”

The study is published in the Royal Society journal Interface.

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YouTube Video UEw2X2VCMS1KYWdWbXFQSGV1YW84WVRHb2pFNkl3WlRSZS43RkJGOTAwRDhCOEQ1RjIy

Is This The Best Dive Center Ever? W\@wakatobidiveresort

@sennacher 
#askmark Hi there, regarding DSMBs. I’m no expert whatsoever and normally I deploy it correctly. This weekend we dove on very strong current and I almost lose my breath while deploying it (mouth inflate) as it tangled a bit on my reg. It scared the sh&t out of me so. Is there any “little cylinder” kind of thing in order to keep my reg in my mouth to deploy it safer?  I haven’t tried to do it with my LPI… but asume it would tangle also.
Thanks
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@sennacher
#askmark Hi there, regarding DSMBs. I’m no expert whatsoever and normally I deploy it correctly. This weekend we dove on very strong current and I almost lose my breath while deploying it (mouth inflate) as it tangled a bit on my reg. It scared the sh&t out of me so. Is there any “little cylinder” kind of thing in order to keep my reg in my mouth to deploy it safer? I haven’t tried to do it with my LPI… but asume it would tangle also.
Thanks
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YouTube Video UEw2X2VCMS1KYWdWbXFQSGV1YW84WVRHb2pFNkl3WlRSZS43RDFFNUM4NkUwRDhEMjRD

Is There an Easier Way to Deploy a dSMB?

How Twinset Valves Work In Scuba Diving | Shutdown Drills And Isolator Tips Explained #scubadiving #askmark #twinset

Confused about how to use twinset valves or perform a proper valve shutdown drill? You’re not alone.

In this AskMark episode, Mark explains how valves work on twin cylinders, including how to safely open and close them, how isolator valves function, and why valve drills (also known as shutdown drills or V-Drills) are critical for diagnosing leaks during technical and recreational dives. Please visit our website for more Scuba news, underwater photography, hints & advice, and travel reports: https://divernet.com/ 

Mark also shares tips on muscle memory for reaching your left and right posts, isolator-first vs isolator-last logic, and how to prevent over-tightening or unsafe valve positioning. This guide is perfect for divers transitioning to twinsets, sidemount divers curious about manifold setups, or anyone wanting to improve their gas management skills. 

Let us know in the comments how your instructor taught valve drills and don’t forget to leave your questions using #AskMark to get featured in a future video. 

@mostafametwally1

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=================================

Disclaimer: The information in this video is not intended nor implied to be a substitute for professional SCUBA Training. This video's content, including text, graphics, images, and information, is for general information purposes only and does not replace training from a qualified Dive Instructor.

🔎 Related Phrases:

How Twinset Valves Work In Scuba Diving, Shutdown Drills And Isolator Tips Explained, How Twinset Valves Work In Diving, Scuba Valve Drill Tutorial, Shutdown Drill For Twin Cylinders, How To Use Twinset Isolator Valve, Twinset Manifold Explained, Best Way To Close Dive Valves, V-Drill For Scuba Divers, Twin Cylinder Gas Management Tips, Scuba Regulator Shutdown Steps, How To Practice Twinset Valve Drills, Muscle Memory For Valve Shutdowns

#scubadiving #askmark #twinset #scubavalves #shutdownskills #divingsafety #scubatraining #scubatech #divetips #manifoldvalve #valvedrill #scubagear #divingtechniques #scubacommunity #technicaldiving

How Do Valves Work on Twin Cylinders? #askmark
@mostafametwally1
#askmark hi Mark. Could you do a video on how to deal with the valves and manifold on twin cylinders. It’s confusing to remember which way to open the valves and it’s easy to get wrong particularly in emergencies. Thanks
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YouTube Video UEw2X2VCMS1KYWdWbXFQSGV1YW84WVRHb2pFNkl3WlRSZS5EQkEyODM0NTk2MUFEQkYz

How Twinset Valves Work In Scuba Diving | Shutdown Drills And Isolator Tips Explained

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