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Shark in Biological News

Negligible impact on public safety from shark cage diving operations

A study by five university researchersincluding four from the University of Hawai'i at Mānoaconcludes that existing shark cage diving enterprises in Hawai'i have a negligible effect on public safety. The paper, "Seasonal cycles and long-term trends in abundance and species composition of ...

Elephant shark genome sequence leads to discovery of color perception in deep-sea fish

The elephant shark, a primitive deep-sea fish that belongs to the oldest living family of jawed vertebrates, can see color much like humans can. This discovery, published in the March 2009 issue of Genome Research , may enhance scientists' understanding of how color vision evolved in early ve...

Over 50 percent of oceanic shark species threatened with extinction

22nd May 2008 The first study to determine the global threat status of 21 species of wide-ranging oceanic pelagic sharks and rays reveals serious overfishing and recommends key steps that governments can take to safeguard populations. These findings and recommendations for action are published in...

Oceanic sharks worldwide at serious risk from high-seas fishing, rising demand for shark products

NEW YORK CITY -Oceanic shark populations worldwide are declining from destructive high-seas commercial fishing practices and a rising global demand for shark products (mainly fins and meat), with some shark populations severely depleted and only a few stable or recovering, according to a comprehen...

New research reveals shark superhighways and hotspots

Boston, Mass.The worlds sharks are disappearing. These fearsome yet charismatic fish continue to fall victim to overfishing and many are now at risk of extinction as a result. New research shows that open-ocean sharks are particularly threatened from overfishing, and other work shows that the deep...

Human deaths from shark attacks hit 20-year low last year

GAINESVILLE, Fla. Fatal shark attacks worldwide dipped to their lowest levels in two decades in 2007 with the sole casualty involving a swimmer vacationing in the South Pacific, according to the latest statistics from the University of Florida. Except for 1987, when there were no fatalities, t...

Conquest of land began in shark genome

GAINESVILLE, Fla. When the first four-legged animals sprouted fingers and toes, they took an ancient genetic recipe and simply extended the cooking time, say University of Florida scientists writing in Wednesdays issue of the journal PLoS ONE. Even sharks which have existed for more than hal...

UNH researchers studying spiny dogfish, Gulf of Maine's mini shark

DURHAM, N.H. For such a small shark species, there seems to be super-sized confusion about its population status. But for researchers at the University of New Hampshire, one thing is clear definite changes have occurred to spiny dogfish shark populations in the past two decades. Commercial ...

Unveiling the underwater ways of the white shark

It's hard to study a creature when you only catch fleeting glimpses of it. Up until recently, that was one of the big stumbling blocks for marine biologists and ecologists, but advances in electronic tracking technology have allowed them to peer farther across, and deeper under, the surface of the...

Ongoing collapse of coral reef shark populations

Investigators have revealed that coral reef shark populations are in the midst of rapid decline, and that “no-take zones”—reefs where fishing is prohibited—do protect sharks, but only when compliance with no-take regulations is high. The findings, reported by William Robbins and colleagues at James...

World shark attacks dipped in 2005, part of long-term trend

Assertive and even aggressive human behavior could explain why shark attacks worldwide dipped last year, continuing a five-year downward trend in close encounters with the oceanic predators, new University of Florida research suggests. Greater safety precautions and in-your-face responses to conf...

Oceans are 70 percent shark free

Marine scientists have discovered that the deepest oceans of the world would appear to be shark free. In a paper published today, an international team of researchers, led by the University of Aberdeen, reveal that sharks have failed to colonise at depths greater than 3,000 metres. Sharks occ...

Great White shark evolution debate involves WSU Lake Campus geology professor

A significant debate is currently underway in the scientific community over the evolution of the Great White shark, and Chuck Ciampaglio, Ph.D., an assistant professor of geology at the Wright State University Lake Campus, is right in the middle of it. The issue is if the Great White, one of the...

Global curbs on overfishing are beginning to work

...ls Atlantis and Ecosim to analyse ecosystem recovery in 31 fisheries worldwide, 10 in detail, including Australia's Southern and Eastern Scalefish and shark Fishery. She says a combination of management measures has been adopted in Australia's commonwealth fisheries in the past decade to reduce pressure...

Policy transparency key to saving world's fisheries

...of British Columbia. "We know, for instance, that in many of these nations, shark populations have been decimated as a result of shark fining. Unfortunately the regulation of this activity remains largely ineff...

Geographic profiling applied to track hunting patterns of white sharks in South Africa

...se it is rarely observed in the wild. As a result, shark predatory behavior has remained much of a mystery....udy. "Sharks are apex predators, so studies of shark hunting behavior are important for understanding t...ce. The researchers found that spatial patterns of shark predation at this site were nonrandom and that sma...

From Jack the Ripper to great white sharks

...ue usually used to hunt serial criminals, can be used to study the hunting patterns of great white sharks. The authors observed the location of 340 shark attacks and used the data to locate the sharks' anchor point. Interestingly, the study also showed that younger sharks exhibited less focused search p...

Fossil bone bed helps reconstruct life along California's ancient coastline

...Sharktooth Hill Bone Bed near Bakersfield, Calif., shark teeth as big as a hand and weighing a pound each, ...009 issue of the journal Geology . The mix of shark bones and teeth, turtle shells three times the siz...fting pile. Given the rarity of bones marked by shark bites, plus the occurrence of terrestrial animals ...

Nontoxic hull coating resists barnacles, may save ship owners millions

...erest in endowing the ship coatings with wrinkled topographies. The coatings share traits with surfaces found in nature, where rough surfaces such as shark skin generally stay free of debris buildup. In contrast, other marine species, such as whales, have smooth skin but often carry barnacles as unwanted...

Non-toxic hull coating resists barnacles, may save ship owners millions

...erest in endowing the ship coatings with wrinkled topographies. The coatings share traits with surfaces found in nature, where rough surfaces such as shark skin generally stay free of debris buildup. In contrast, other marine species, such as whales, have smooth skin but often carry barnacles as unwanted...

A big lesson from the reef

...s identified a continued collapse in the populations of reef sharks on the Great Barrier Reef from over-fishing and his work is now helping to improve shark management in Queensland. Sean Connolly ranks in the top 1 per cent of the world's ecological scientists in terms of the number of times his work ...

UIC biologists use DNA to study migration of threatened whale sharks

...rstand the sharks' lifestyle. We can only protect their habitat if we know what habitat they use." Schmidt credits some countries for closing whale shark fisheries and hopes that efforts such as ecotourism programs, which sometimes include swims with the gentle giants, may prove an attractive economic a...

Research links evolution of fins and limbs with that of gills

...hat when paired appendages appeared, the mechanism used to pattern the skeleton was co-opted from the gills," Gillis said. "Perhaps we should think of shark gills as another type of vertebrate appendageone that's patterned in essentially the same way as fins and limbs." The deep structural, functional,...

Shark attacks decline worldwide in midst of economic recession

...a slump of a different sort: an unexpected dive in shark attacks, says a University of Florida researcher. shark attacks worldwide in 2008 dipped to their lowest l...s, ichthyologist and director of the International shark Attack File, which is housed at UF. According t...

Endangered sawfish focus of national collection and recovery efforts

... GAINESVILLE, Fla. The University of Florida, keeper of the world's shark attack records, is also now overseeing a national records collection for an...id George Burgess, a UF ichthyologist and curator of both the International shark Attack File and the newly expanded National Sawfish Encounter Database. ...

Scientists call for protected 'swimways' for the endangered leatherback sea turtle

...ution, which includes the "Cocos Ridge Marine Wildlife Corridor," designed to shield the critically endangered Pacific leatherback and the hammerhead shark from longline and gillnet fisheries. Recent satellite tracking data from Stanford University researchers shows that after nesting on the beaches in P...

Great white's mighty bite revealed

..., making it arguably the most formidable carnivore ever to have existed. shark researchers from the University of New South Wales, Newcastle University, N...ey generated 3-Dimensional models the skull of a 2.4-metre male great white shark on the basis of multiple x-ray images generated by a computerized tomograph...

The mystery of mass extinctions is no longer murky

...lates and to changes in climate. There were periods of the planet's history when vast areas of the continents were flooded by shallow seas such as the shark and mosasaur infested seaway that neatly split North America during the age of the dinosaurs. As those epicontinental seas drained, animals like mo...

Building on pyramids of trash

...om the most outlandish of materials from Chris Ofili's depiction of the Holy Virgin Mary encrusted with elephant dung and Damien Hirst's pickled tiger shark representing life and death to the unmade bed of Tracey Emin and the unspeakable bodily fluids of avant garde duo Gilbert & George. But all of these w...

Can certain metals repel sharks from fishing gear?

...to reduce the bycatch of sharks in longline gear. shark bycatch is an increasing priority worldwide given diminished populations of many shark species, and because sharks compete with target sp... maturity. These factors result in an inability of shark populations to support high rates of fishing morta...

Deep-sea sharks wired for sound

... track the sharks movements in a closed area designed to protect the gulper shark a species which is severely depleted over much of its range and is nominat...e fish such as blue eye trevalla and pink ling, but is also home to several shark species vulnerable to over-fishing. The fishery has taken steps to reduc...

Ocean's fiercest predators now vulnerable to extinction

... from the worlds oceans. The numbers of many large shark species have declined by more than half due to increased demand for shark fins and meat, recreational shark fisheries, as well as tuna and swordfish fisheries...

2008 Pew Fellowship in Marine Conservation awarded to Fan Meng; first Chinese fellow

...discards. Each Fellow will carry out pioneering projects to safeguard marine ecosystems that are sorely in need of protection, said Dr. Pikitch, a shark expert and conservation biologist, and a 2000 Pew Fellow in Marine Conservation herself. The ocean cant speak for itself, and these are the people wh...

2008 Pew Fellowship in marine conservation awarded to UM Rosenstiel's Dr. Andrew Baker

...ow will carry out pioneering projects to further understand and safeguard marine ecosystems that are sorely in need of protection, said Dr. Pikitch, a shark expert and conservation biologist, and a 2000 Pew Fellow in Marine Conservation herself. The ocean cant speak for itself, and these are the people wh...

Photo-monitoring whale sharks

...much as 20 tons, its enormous size gives the whale shark (Rhincodon typus) its name. Known as the gentle g...urism to study the rare species and suggests whale shark populations in Ningaloo, Western Australia are hea...phs were taken while swimming alongside each whale shark and photographing or video-taping the white lines ...

UF to auction naming rights for new butterfly species online

...nservation efforts in eastern Indonesia, setting a record for this type of event. Prices for the naming rights ranged from $500,000 for a Hemiscyllium shark from Cendrawasih Bay to $50,000 for the Pseudanthias fairy basslet. The winning bidder for the new owl butterfly will have the name of his or her c...

New research shows sharks use their noses and bodies to locate smells

...ion and localization in the smooth dogfish shark. The results, which appear in the June 1 issue of the Journal of Experimental Biology, show that this shark is severely handicapped in its ability to locate the source of an odor when deprived of information from its lateral line, particularly in the dark. ...

Saving endangered whales at no cost

...tuna longline industries that expend much more effort than needed to obtain optimal yields, while threatening turtles and non-targeted fish, including shark species, as bycatch....

Overfishing large sharks impacts entire marine ecosystem, shrinks shellfish supply

...led to an explosion of their ray, skate, and small shark prey species. "With fewer sharks around, the...t decades to meet the growing worldwide demand for shark fins and meat." Sharks are targeted in numer... approach to fisheries management." As great shark populations plummeted, their elasmobranch prey—ray...

Triple threat: World fin trade may harvest up to 73 million sharks per year

...e October 2006 edition of Ecology Letters. "The shark fin trade is notoriously secretive. But we were a...ds and convert from fin sizes and weights to whole shark equivalents to get a good handle on the actual num... Kong traders. When the figures were converted to shark weight, the total is three to four times higher th...
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