Fairhaven's popular recreational quahogging location, Round Cove, has been closed due to heightened bacteria levels. But officials are at a loss to explain where the bacterium is coming from. Reggie Zimmerman, spokesman for the Division of Marine Fisheries says there is no evidence of a pollution source anywhere near the shoreline of Round Cove. Though Jack's Cove, East Cove and the west side of Sconticut Neck remains open to shellfishing. Harbormaster David Darmofal adds the town is considering opening Senior's Cove to recreational license holders for one weekend day per month over the summer to encourage family quahogging. Recent water quality tests found the population of the bacterial fecal coliform exceeded the standard set by the National Shellfish Sanitation Program. Round Cove will be closed at least through October, depending on what the state testing finds.