A day after the Atlantic White Shark Conservancy tagged its first two great white sharks of the season in Cape Cod Bay, a beach on the Outer Cape was closed to swimmers for a short time Tuesday after a great white shark was spotted offshore.

On Monday, at least 11 white sharks were spotted in the bay, and two were tagged by Greg Skomal, senior fisheries scientist with the state Division of Marine Fisheries. All of the sharks were on Billingsgate Shoal. The sharks that were tagged were 9 feet and 10 feet long.

Skomal’s work with the conservancy is expanding into Cape Cod Bay this year, following frequent reports last year of sharks snagging fish caught by passengers on charter boats. In the past, experts have mostly focused on shark activity in the Outer Cape.


That’s where a great white shark was seen on Tuesday. A lifeguard spotted the shark at 12:15 p.m. about 40 yards off the coast of Marconi Beach in Wellfleet, according to Cape Cod National Seashore Acting Chief Ranger Ryan Wright. The lifeguard decided to close the beach for an hour following the sighting, he said.

Sophia Eppolito can be reached at sophia.eppolito@globe.com. Alyssa Lukpat can be reached at alyssa.lukpat@globe.com.