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Dave Martin apparently bled to death after being bitten across his thighs.
Dave Martin, a retired veterinarian, was pronounced dead shortly after the incident, which occurred about 7 a.m. Friday (10 a.m. ET) at Solana Beach, California.
Martin was in a group of nine swimmers "when he was bitten across both thighs by what is believed to be a great white shark," according to a statement issued by the San Diego County Sheriff's Department.
"Some of the other swimmers looked back to see the victim up out of the water flailing, and (he) was pulled back under the water. He came up screaming and was helped to shore by four of the swimmers."
Martin was taken to a nearby lifeguard station, and a medical helicopter was called in, but he apparently bled to death at the scene, the statement said.
Deputy Fire Chief Dismas Abelman said Martin suffered severe injuries to both his legs, although his body was intact. He was pronounced dead at 7:49 a.m.
Watch officials describe the attack »
The incident occurred in the Fletcher Cove area of Solana Beach near a popular surf spot known as Table Tops, one of the main access areas to Solana Beach, said Sheriff's Lt. Mike McClain.
A sheriff's helicopter was scanning the beaches for the shark, and nearby beaches were contacted, Solana Beach officials said in a statement posted on the city's Web site.
Swimmers were ordered out of the water, and a 72-hour swimming advisory was posted for an 8-mile stretch of beach, said Capt. Craig Miller of the city's marine safety department.
The beaches remain closed and will be patrolled throughout the weekend, city and county officials told The Associated Press.
City officials noted, however, that they were not trying to capture or kill the shark. Great white sharks are protected by law in California.
"I would say from my examination of the wounds on the victim and also the narrative that I got about how the attack happened that this almost certainly was a great white shark," said Richard Rosenblatt, professor emeritus of marine biology at the Scripps Institute of Oceanography.
"I was told that the victim was pushed up out of the water in a violent attack, and that's just typical of white shark feeding behavior. They normally feed on seals," Rosenblatt said. "They attack from below, make a tremendous powerful rush, make a powerful bite and then pull away and wait for the seal or other marine mammal to bleed to death, and then come back."
Although there is not a population of great white sharks in the area, females do come down from colder waters to give birth and then return, he said.
In addition, such sharks are remarkable swimmers. A shark tagged off Monterey, California, turned up in Hawaii, Rosenblatt said, and one tagged in South Africa was found in Australia.
The wounds "were really quite clean and massive," Rosenblatt said, and typical of those a great white might leave. If tooth fragments are found at autopsy, he said, it might be possible to identify the type of shark. However, he said, finding the shark that attacked Martin is unlikely.
Martin leaves behind a family "and a lot of friends that loved him," said Rob Hill, a friend of the family.
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Ceux qui me connaissent savent l'impact que ce genre de nouvelles peut avoir sur moi, alors je vous laisse lire:
A surfer was attacked by a shark in Monterey Bay early today and airlifted to a hospital with bite wounds to his torso and thigh, according to hospital and state park officials.
The 24-year-old victim, whose name was not released, was surfing with a half dozen other people at Marina State Beach when the shark attacked him from behind around 11 a.m., according to Loren Rex, a California State Parks spokesman.
The victim screamed and started punching the shark while trying to flee, Rex said.
"Then the shark took him down under the water," he said. "Witnesses saw a lot of thrashing and some blood coming up. Other witnesses saw the shark let him up before biting him one more time."
One witness said the shark was a great white shark measuring at least 20 feet long, which rescuers weren't able to immediately confirm, Rex said.
Surfers pulled the victim to shore and administered first aid, using a surf leash and a blanket as tourniquets to stop the bleeding until rescuers could arrive, Rex said.
The victim was conscious and breathing when he was taken away by ambulance. He was then airlifted to Santa Clara Valley Medical Center in San Jose, where he was in fair and stable condition Tuesday afternoon with lacerations to his torso and thigh, according to hospital spokeswoman Joy Alexiou.
The victim was going into surgery and was expected to survive, Alexiou said.
The Monterey County beach, located about 35 miles south of Santa Cruz, is well known for its sand dunes, hang gliding and rugged surf with very strong rip currents. The area where the surfer was attacked is considered an advanced surfing spot suitable only for skilled surfers.
Because of the attack, state officials closed all the beaches from Monterey State Beach to Moss Landing, a 15-mile stretch where people were forbidden from entering the water Tuesday.
Rex said this was the first recorded shark attack at Marina State Beach, but added that some divers have been attacked in Monterey Bay.