As reported on www.signonsandiego.com:
San Diego lifeguards are warning beachgoers to be alert after two reported sightings of a possible great white shark on Sunday afternoon, one by a kayaker and the other by a lifeguard, said Maurice Luque, San Diego Fire-Rescue Department spokesman.
He said lifeguards are advising beach visitors on Monday “to use their own judgment as to whether or not they want to go into the water.”
The advisory spans the area from La Jolla Cove to the Scripps Pier. It is among the most heavily used coastal zones in the region, drawing swimmers, kayakers, sun bathers and others.
The first incident was Sunday morning when a kayaker said he spotted a shark about two miles offshore that was longer than his boat, said Lifeguard Sgt. Rich Stropky.
At about 4:30 p.m., lifeguards in the main tower spotted a fin roughly 50 yards offshore near the Tower 30 at the southern end of Kellogg Park.