A 13-foot-long great white shark has been detected off the coast of Chatham, the state Department of Fish and Game said.
State biologists located the animal off Monomoy National Wildlife Refuge, the agency said in a statement.
Biologists are familiar with the female shark, which they first tagged in 2011. A radio receiver off the coast of Cape Cod notified biologists last week of the shark’s presence, the statement said.
Great white sharks feed on seals and biologists speculated this one may have come to the Commonwealth to hunt the grey seals that migrate here, the statement said. Chatham is a particularly popular spot for seals to congregate.
The Department of Fish and Game urged beachgoers to stay close to the shore and avoid swimming at dawn and dusk.
Last summer, a Boston man swimming in Truro survived the first shark attack in the Commonwealth since 1936.