Those change from year to year; recently, there have been large aggregations off Santa Barbara, and fewer in San Diego, possibly because of red tide events, he said. On a cloudy morning Wednesday, shark researchers from Cal State Long Beach followed a young white shark as it wound its way along the shore off Del Mar. Shark Sightings Reported Off Coronado Beach - San Diego, CA - Initial reports from witnesses indicated they saw four sharks, ranging from six to 10 feet in length. That's what the researchers saw Wednesday, as they searched for sharks off Del Mar. Surfers lined up along the low waves, distance swimmers paddled to an outer buoy, and kids splashed at the water's edge. White sharks, known popularly as "Great Whites," are regular visitors that share the sea with us daily, new studies are finding. "We have lots of stingrays in our water.". Potentially fewer stingrays, for one thing, as young sharks gobble them up. Although, there is a possibility it is a big Mako.” Dr. Lowe believes the shark was just feasting on a sea lion. Burke said he swam with sharks before, but he was in awe watching the shark feast. The juvenile white shark they followed Wednesday appeared to follow that playbook, evading researchers for hours while they tried unsuccessfully to track and tag it. The young sharks are usually about four to nine feet long, they said, and likely seek shallow waters for heat, food and protection. Sheer numbers are part of the equation. They did not post a warning. "We’re definitely not on their menu," Lowe said. What does this mean for humans? When bites do happen, they can be catastrophic, such as the fatal attack on Solana Beach triathlete Dave Martin in 2008, or the life-threatening leg injury that swimmer Leeanne Ericson sustained at "Church" beach off San Onofre in 2017. “You could almost see a breach. Those change from year to year; recently, there have been large aggregations off Santa Barbara, and fewer in San Diego, possibly because of red tide events, he said. So what tips the scales, and turns a passing encounter into an attack? The water was calm, but the overcast sky cast an opaque glare onto the surface, making it hard to see creatures below. “We kind of zoomed over there and I am sure we looked like lunatics, waving out for them to stay away. They're working closely with lifeguards at Southern California beaches to analyze how people use the water, and what happens during white shark interactions. Drone surveys will help quantify that. Might we also be meals for hungry sharks? And then we can get that out to the public so they can modify their behavior if necessary.". We know that people are occasionally bitten. White sharks congregate at “hot spots” including Santa Barbara, Ventura, Santa Monica Bay, Long Beach/Huntington Beach, and the San Clemente/San Onofre area, said Patrick Rex, a graduate student at the Shark Lab. Just as they reached the spot, the drone began losing power, and Rex brought it in to replace the battery. Student pilot Asher Burke said he and his instructor saw a red blotch of water. Beach use estimates often include cars in the parking lots, or rough head counts on the shore. Lifeguards were notified and told News 8 they could not make out if it was a shark or not. "We look at how many sharks are in close proximity to people, and we also look at how sharks behave when they’re close to people," Lowe said. Tighter regulations on fisheries have reduced bycatch of sharks in nets, and marine mammals such as sea lions have recovered, increasing food resources for adult white sharks. The team has also developed a buoy with a real-time sensor that will alert lifeguards and scientists by text each time a white shark swims by. That's a scene that takes place routinely on the Southern California coast, where beachgoers unwittingly swim alongside white sharks. So younger ones, with smaller body mass, gravitate to warmer water. DEL MAR (KUSI) – Lifeguards in Del Mar are monitoring local waters after shark sightings in the area. They collect the data monthly and share with the lifeguards, Lowe said. SAN DIEGO (NEWS 8) – Cellphone video captured by a helicopter pilot on Wednesday shows a shark snacking on a sea lion in the waters off La Jolla shores – not far from swimmers and kayakers. The footage they captured didn't represent a rare appearance of the ocean predator among beachgoers, but an everyday occurrence on the Southern California coastline. 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