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A shark preying on a seal at the Alcatraz Island dock was witnessed by a group of tourists and park officials Saturday. At around noon tourists waiting for the ferry witnessed a large pool of blood at the surface. What appears to be a 8-10 foot great white shark consumed the carcass at the surface within feet of the dock. A National Parks staffmember confirmed the event by email. “This is the first recorded predation event I know in the San Francisco Bay,’ said David McGuire, Director of the San Francisco based shark conservation group Shark Stewards and Research Associate at the California Academy of Sciences. “It definitely looks like a white shark, about 8-10 feet from the phone video sent to us. The tourists were pretty excited.”