Sharks swim and hunt – inside their mothers

Last Updated on December 23, 2018 by

DIVING NEWS

Sharks swim and hunt – inside their mothers

Tawny Nurse Shark Tchami

Tawny nurse shark. (Picture: Tchami)

It has long been known that some unborn sharks eat not only surplus eggs inside their mother’s womb but even their embryonic siblings. Now it seems that these pups can also swim between uteruses to maximise their feeding opportunities.

Many species of shark mature their eggs and gestate the embryos in a pair of uteruses, one on each side of the body. Now researchers at Okinawa Churaumi Aquarium in Motobu, Japan have completed a study in which they used “underwater ultrasound” to record the pups of three captive tawny nurse sharks (Nebrius ferrugineus) not only active inside their initial womb but moving between the two.

23 December 2018

The researchers describe the report as the first reliable evidence of “active embryonic locomotion” in live‐bearing vertebrates, contradicting the generally accepted concept of mammalian embryos being sedentary.

The water- and pressure-resistant type of ultrasound device used in the study was similar to the type used recently by scuba divers to check the state of pregnancy in free-swimming whale sharks in Galapagos, as reported on Divernet .

The Okinawa researchers captured ultrasound clips from three pregnant aquarium sharks over several years.

A total of 24 migrations were observed during one mother’s pregnancy, with one of the scans succeeding in capturing a moment of transfer, which occurred at a far-from-sedentary 8cm a minute.

One shark began her pregnancy with two pups in each uterus, and by the time she gave birth only one remained.

The research is published in Ethology.

This week, it looks like DPV manufacturer ScubaJet has begun insolvency proceedings. PADI has distributed half a million dollars in their Project Aware campaign. Dorset coastguard have called off the search for a missing diver. And the Pearl Fleet has commented on a viral video of a shark-dive that didn’t go so well
https://taucher.net/diveinside-insolvency_proceedings_at_scubajet-kaz9246
https://divernet.com/scuba-news/conservation/padi-aware-distributes-500k-in-mission-hub-grants/
https://www.scubadivermag.com/raid-launches-ots-full-face-mask-programme/
https://www.scubadivermag.com/dorset-coastguard-call-off-search-for-diver/
https://divernet.com/scuba-news/health-safety/search-for-diver-off-dorset-stood-down/
https://divernet.com/scuba-news/health-safety/pearl-fleet-hits-back-as-maldives-shark-dive-slammed/
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The information in this video is not intended nor implied to be a substitute for professional SCUBA Training. All content, including text, graphics, images, and information, contained in this video is for general information purposes only and does not replace training from a qualified Dive Instructor.

This week, it looks like DPV manufacturer ScubaJet has begun insolvency proceedings. PADI has distributed half a million dollars in their Project Aware campaign. Dorset coastguard have called off the search for a missing diver. And the Pearl Fleet has commented on a viral video of a shark-dive that didn’t go so well
https://taucher.net/diveinside-insolvency_proceedings_at_scubajet-kaz9246
https://divernet.com/scuba-news/conservation/padi-aware-distributes-500k-in-mission-hub-grants/
https://www.scubadivermag.com/raid-launches-ots-full-face-mask-programme/
https://www.scubadivermag.com/dorset-coastguard-call-off-search-for-diver/
https://divernet.com/scuba-news/health-safety/search-for-diver-off-dorset-stood-down/
https://divernet.com/scuba-news/health-safety/pearl-fleet-hits-back-as-maldives-shark-dive-slammed/
Diving Into The Darkness Link:
https://www.scubadivermag.com/affiliate/mzsd


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

YouTube Video UEw2X2VCMS1KYWdWbXFQSGV1YW84WVRHb2pFNkl3WlRSZS5GNzRBRjZBMTFFRDU2OERD

Missing Diver Search Called Off #scuba #news #podcast

@preethasebastian8921
Sharks and Yum Yum Yellow. What are your thoughts? #askmark
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@preethasebastian8921
Sharks and Yum Yum Yellow. What are your thoughts? #askmark
#scuba #scubadiving #scubadiver
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YouTube Video UEw2X2VCMS1KYWdWbXFQSGV1YW84WVRHb2pFNkl3WlRSZS4zMzg4MjBBNzZCQzY5MDk4

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@emilyZA460
#AskMark hi! I was hoping you could help me understand the interchangeability of a DSMB and a simple SMB if I only plan to use it when I deploy it during my safety stop at 5 meters. I used the simple version for this purpose during my last liveaboard and despite occasionally having to reinflate at the surface due to some air escaping while being deployed underwater, it didn’t seem to be too problematic and so I was wondering if it’s necessary to have a DSMB for this purpose? The issue for me is that somehow I tend to end up misplacing my SMB quite often and so the price difference between the two makes it a more acceptable loss when it’s replacing the SMB regularly rather than the DSMB at double the cost
#scuba #scubadiving #scubadiver
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The information in this video is not intended nor implied to be a substitute for professional SCUBA Training. All content, including text, graphics, images, and information, contained in this video is for general information purposes only and does not replace training from a qualified Dive Instructor.

Diving Into The Darkness Website:
https://www.scubadivermag.com/affiliate/mzsd

@emilyZA460
#AskMark hi! I was hoping you could help me understand the interchangeability of a DSMB and a simple SMB if I only plan to use it when I deploy it during my safety stop at 5 meters. I used the simple version for this purpose during my last liveaboard and despite occasionally having to reinflate at the surface due to some air escaping while being deployed underwater, it didn’t seem to be too problematic and so I was wondering if it’s necessary to have a DSMB for this purpose? The issue for me is that somehow I tend to end up misplacing my SMB quite often and so the price difference between the two makes it a more acceptable loss when it’s replacing the SMB regularly rather than the DSMB at double the cost
#scuba #scubadiving #scubadiver
LINKS

Become a fan: https://www.scubadivermag.com/join
Gear Purchases: https://www.scubadivermag.com/affiliate/dive-gear
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Website: https://www.scubadivermag.com ➡️ Scuba Diving, Underwater Photography, Hints & Advice, Scuba Gear Reviews
Website: https://www.divernet.com ➡️ Scuba News, Underwater Photography, Hints & Advice, Travel Reports
Website: https://www.godivingshow.com ➡️ The Only Dive Show in the United Kingdom
Website: https://www.rorkmedia.com ➡️ For advertising within our brands
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We partner with https://www.scuba.com and https://www.mikesdivestore.com for all your gear essentials. Consider using the affiliate link above to support the channel.

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

YouTube Video UEw2X2VCMS1KYWdWbXFQSGV1YW84WVRHb2pFNkl3WlRSZS4yOUY5MUNBMTM5RDMyREQ5

What's the Point of Fancy dSMBs? #askmark #scuba

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