Scientists have observed instances in which tuna rub themselves against the side of sharks. Apparently, they do this to dislodge painful parasites that cling to their head, eyes and gills.
“Shark skin is really smooth in one direction and it’s like sandpaper in the other,” said Chris Thompson, a Research Fellow at the University of Western Australia.
Thompson and his colleagues observed this behaviour after studying the footage of floating, baited underwater cameras which they had deployed in 36 regions in the Pacific, Indian and Atlantic Oceans in 2012 to 2019.
Apeks Exotec SCUBA Diving Buoyancy Compensator Devices (BCDs)
The dump valve knob can get stuck when the recalled BCD is inflated, opening the dump valve which stops the BCD from fully inflating. This can result in a loss of buoyancy control and poses injury (decompression sickness) and drowning hazards.
Repair
October 20, 2022
330
In Ireland, new regulations giving the basking shark the "protected wild animal" status under the Wildlife Act came into effect on 9 October. The order was signed by Minister of State for Heritage Malcolm Noonan, and Minister for Agriculture, Food and the Marine Charlie McConalogue. This legislation was heavily supported by the Irish Basking Shark Group (ISBG), an international network of researchers, educators, and community representatives founded in 2009.
Whale watchers were making their way toward the U.S.-Canadian border in the Strait of Juan de Fuca when the captain spotted the group of whales. At first, whale watchers observed what they thought was a pod of roughly 15 Bigg’s orcas swimming and "being unusually active at the surface." Before long, it became apparent that two humpback whales were in their midst.
According to observers who came and went throughout the day, the intense encounter that unfolded included an astonishing three hours of breaching, tail-slapping and loud vocalizations.
For several years, scientists have suspected that orcas have been killing and eating parts of great white sharks. Now, they have video evidence to prove it.
New drone and helicopter footage show a pod of orcas ruthlessly pursuing a great white shark in Mossel Bay, South Africa for more than an hour before going in for the kill. The video culminates with one of the killer whales gobbling up a large chunk of the shark's liver.
Being able to hover, move smoothly and efficiently through the water, and streamline your equipment is not just a matter of style and elegance but one of safety and protecting the environment.
Artificial reefs are increasingly used worldwide as a method for managing recreational diving since they have the potential to satisfy both conservation goals and economic interests.
Although there are negative impacts associated with mass diving tourism, scuba diving has the potential to generate substantial revenues. However, balancing the requirements of reef conservation with the needs of local host economies represents a considerable challenge to managers and policymakers.
The ecological role of shipwrecks as artificial reefs is well established and they are often prime and exclusive destinations for diving tourism. But they are also extremely delicate and sensitive environments.