Video: First Record of Great White Shark Attack in San Francisco

A new video shows a great white shark eating what appears to be the remains of a sea lion off Alcatraz, in San Francisco Bay. REUTERS

For the first time, a great white shark has been observed attacking and killing another creature in San Francisco Bay, just off Alcatraz.

The event took place October 10, and it was filmed by visitors to the island. In the video below you can see a large patch of blood in the water, and a great white shark surfacing to eat a chunk of what appears to be sea lion flesh.

"This is the first recorded predation event I know in the San Francisco Bay," David McGuire, director of the San Francisco–based shark conservation group Shark Stewards and research associate at the California Academy of Sciences said in a statement. "It definitely looks like a white shark, about 8 to 10 feet [long], from the phone video sent to us. The tourists were pretty excited."

McGuire told NBC Bay Area the prey was most likely a sea lion, but he couldn't be sure.

Several great white sharks tagged by researchers have been recorded entering waters of the bay in the last few years; five of the animals, for example, ventured into the bay in 2007 to 2008. But this is the first record of one attacking and feeding on a large marine mammal.

There are no modern records of a shark attack on a human in the bay. In May 1959, however, an 18-year-old named Albert Kogler Jr. died after being attacked by a shark while swimming off of San Francisco's Baker Beach, on the Pacific Ocean just on the other side of the Golden Gate Bridge. There have been 13 fatal shark attacks reported in California over the past 60 years, according to the Shark Research Committee, a science group.