Most of Sengekontacket Pond has been reopened for clamming and quahaugging.

The pond was opened on Saturday of Columbus Day weekend after shellfish constables in Edgartown and Oak Bluffs got a green light from the state.

The bay scallop fishery opened on Oct. 1, but the state kept the pond closed to quahaugging and clamming pending the results of further tests. The pond has been closed to shellfishing since June for the fourth year due to bacterial contamination. The source of the contamination is not clearly understood.

Major’s Cove and Trapp’s Pond are still closed.

Meanwhile, recreational shellfishermen flocked to the pond over the warm Columbus Day weekend.

“The weekend was a hotbed of activity,” said Edgartown shellfish constable Paul Bagnall. “There were half a dozen people clamming for quahaugs and steamers. And there were maybe 15 people out looking for bay scallops.”