SCUBA News (ISSN 1476-8011)
Issue 274 - May 2023
Mantas galore in Mozambique, but also everything from whale sharks down to mantis shrimps.
Voted the best dive site in Europe, the Zenobia lures divers to Cyprus. But Cyprus has many other good dives to explore.
Clear waters, abundant marine life and diverse underwater topography, ranging from coral reefs to dramatic granite formations and shipwrecks.
Health and Safety Executive Scuba Qualification
Hello. I need my HSE scuba certificate for film and Tv work. Is there anywhere abroad I can go to do it?
Hi Harlon, Interesting question but sorry, there are none that we know of. If any readers know of any please let us know.
The grey seal (Halichoerus grypus) is the second largest seal in the world, second only to the elephant seal. It lives in the northern Atlantic, with half of the world's population living around the British Isles.
For hundreds of years the seals were absent or in very low numbers in the North Sea, mainly due hunting. Since the 70s though, when protection for the seals started to be put in place, they have flourished.
Grey seals spend more than 80% of their time at sea and 90% of that below the surface. They are curious and will approach divers, especially the younger seals.
The seals return to the same shore to haul out. They don't stay close to that area though, they can travel over 100 km between their haul-out and foraging sites. These feeding trips last as much as 30 days, and they can cover the 100 km in just one day.
Like most marine mammals, grey seals communicate using calls and whistles, but these seals also clap to warn off competitors and advertise to potential mates.
Amazingly, grey seals can dive to 477 metres. However, they mostly don't go much below 100 m, searching for food.
Female grey seals have been recorded living to 42 years in the wild. Males are thought to live less long, to a maximum of 31 years.
The grey seal is so called because of its coat, which is various shades of grey. The pups though are born white. Female pregancies last 11 months, and they then look after the pup until around three weeks later when it is weaned.
Sayer, S. et al. (2019). Pinnipeds, people and photo identification: The implications of grey seal movements for effective management of the species. Journal of the Marine Biological Association of the United Kingdom, 99(5), 1221-1230. doi:
Grey seals discovered clapping underwater to communicate, Monash University
W. D. Bowen et al (2006) Reproductive performance in grey seals: age-related improvement and senescence in a capital breeder Journal of Animal Ecology.
Boehme, Lars et al. (2012). How Many Seals Were There? The Global Shelf Loss during the Last Glacial Maximum and Its Effect on the Size and Distribution of Grey Seal Populations. PloS one.
Harnessing the sun to make Red Sea liveaboards more sustainable
Ranching sea cucumbers to repair the oceans -- and improve human health
Titanic: First ever full-sized scans reveal wreck as never seen before
Record broken for living underwater
Hammerhead sharks are first fish found to hold their breath
Reducing Vessel Strikes to North Atlantic Right Whales
Coastal lights trick coral reefs into spawning earlier than they should
Within just a few months a deadly epidemic killed all the black sea urchins in the Gulf of Eilat
Why The Ocean Cleanup might not be a good thing
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