On Factory Island in Saco, signs mark the area where the Maine Department of Marine Resources does not allow fishing on the Saco River. Under the nearby Main Street bridge, the boundary of the closed area, an angler casts a line. (Megan Gray/Staff Writer) SACO — Maine Marine Patrol has issued a blitz of summonses and warnings this spring for alleged violations of striped bass regulations on the Saco River. The state prohibits fishing in parts of the river on both sides of Factory Island.