Latest

Using sounds of healthy reefs to attract young fish

Healthy coral reefs are full of sounds of life—with the whistles, pops and grunts of fish, the crackle of snapping shrimp, etc. These sounds travel out through the ocean currents, and “advertise” to young fish to come and settle down at this particular reef ecosystem.

However, when reefs are degraded or dying, the environment falls silent. Literally.

As a result, young fish do not find their way to such reefs, and this exasperates the reef's dire situation.

Out of Air with Plenty to Breathe

Take responsibility for opening your own cylinder valve before a dive. If someone else wants to do it for you or touches it to check it is open, politely refuse.

It was a beautiful day in Indonesia’s Banda Sea. Richard rolled back into the warm waters and swam over to join his wife, Florence. After exchanging signals, they descended together, heading for a patch of bright yellow sea fans on the reef wall at 30m, where their guide had promised to show them pygmy seahorses. The guide was already there below, searching for the elusive little creatures.

It appears that the presence of boats has an impact on the social behaviour of humpback whales.

Humpback whales less sociable in presence of boats

After studying humpback whales off Queensland's Peregian Beach, researchers discovered that the whales’ ability to communicate and socialise is adversely affected by the noise and presence of boats.

In some cases, the mammals’ communication range is reduced by a factor of four.

"It appears that groups of humpback whales tend to socialise much less in the presence of vessels—in this study, mostly small fishing boats—compared to when there aren't any present," said Rebecca Dunlop from The University of Queensland's Cetacean Ecology and Acoustics Laboratory.

The anemone fish's survival is at stake, due to climate change.

"Finding Nemo" clownfish won't survive climate change

A recent study by France’s National Centre for Scientific Research (CNRS), Woods Hole Oceanographic Institution (WHOI) and colleagues indicates that the anemonefish does not have the genetic ability to adapt swiftly enough to climate change.

The findings of the study were published in the November 27 issue of the Ecology Letters journal.

The research was conducted in the lagoons of Kimbe Bay, covering more than a decade. This area is a biodiversity hotspot in Papua New Guinea.

Shortfin mako shark

US & EU keep makos unprotected

The shortfin mako shark fishery of the north Atlantic is one of those that fisheries scientists have claimed to be potentially sustainable. It has been used to promote the idea that all shark fisheries can become sustainable, with the United States in the lead.

But in the meantime, the species has become globally endangered, and now, when other countries are urgently fighting for protection for the shortfin mako shark, the United States and the European Union have blocked it at the annual meeting of the International Commission for the Conservation of Atlantic Tunas (ICCAT).

AquaSketch inventor, Mark Hagan, holds the wrist-size version of the device, which scrolls 8 feet of mylar, allowing divers to write and draw underwater on paper

Innovator interview: aquaSketch – Write & draw on paper underwater

aquaSketch

Interview with owner and inventor Mark Hagan, whose scrolling sketch pad with 30 feet of waterproof mylar and smaller wrist model with 8 feet of mylar allows divers and researchers to write and draw on paper underwater (6 minutes). For more information, go to: aquasketch.com

 

 

USS Grayback, a U.S. Navy submarine lost in 1944 to enemy air attack, has been found.

Wreck of World War II submarine USS Grayback discovered off Japan

The submarine was found by the Lost 52 Project, which locates lost U.S. World War II submarines, and is the first U.S. submarine discovered off the coast of Japan. Japanese records indicate that the sub was sunk by a 500-pound bomb dropped by a naval bomber in February 1944.

British U class submarine HMS URGE under way.

Wreck of WWII British submarine found off Malta

HMS Urge—part of Britain's 10th Submarine Flotilla—left the Mediterranean island of Malta on April 27, 1942 but never made it to its destination of the Egyptian port of Alexandria. Until its discovery this summer, the reason for both the ship's disappearance and its final resting place were unknown. The discovery of HMS Urge suggests it sank in 1942 after hitting an explosive marine mine placed by an enemy German warship.