A conservation group is suing Cooke Aquaculture USA for alleged ocean pollution from its salmon-farming sites along the Maine coast.

Boston-based Conservation Law Foundation filed a lawsuit in the District Court of Maine against the company, part of Saint John-based Cooke Inc.'s wordwide operations.

The 44-page lawsuit focuses on 13 active cage sites for salmon farming in the ocean just off the Maine coast. The sites consist of net pens anchored to the sea floor and to floatation devices on the o…