UMaine shellfish study highlights changes in the Damariscotta River   WALPOLE, Maine — The rich ecosystem of the Damariscotta River estuary still holds many mysteries.  Some of its most visible residents — oysters, alewives, seals and birds — are counted regularly. But, until this year, the wild shellfish of the upper estuary, have gone uncensused.  read more UMaine shellfish study highlights changes in the Damariscotta River