The South Shore’s first shark-detecting buoy was set afloat off Duxbury Wednesday, with three more placed along the Plymouth coastline Friday.

The buoys, attached to acoustic receivers, will track any tagged sharks swimming within a 200-yard radius.

“We’re trying to get a sense of local movements of white sharks and their behaviors for the purpose of public safety,” said Gregory Skomal, a senior biologist with the state Division of Marine Fisheries.

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