River Tywi these fish to over in weight. In summer and autumn there is also a substantial run of Atlantic salmon ("Salmo salar"). In May the Tywi has a run of the rare and protected twaite shad ("Alosa fallax") and allis shad ("Alosa alosa"). The Tywi also contains brown trout, eels, pike, and a variety of small fish species, and is home to brook lampreys, river lampreys and sea lampreys. The Tywi has the distinction of having accidentally produced by far the biggest fish ever taken on rod and line in fresh water in Britain. This was a sturgeon ("Acipwienser sturio") weighing
Coonamesset River cranberry bogs that run to the rivers edge. Long ago nearly the entire river may have been bordered by red maple or white cedar swamp when the Wampanoag fished for herring. After European settlers arrived in 1660, the river was initially known as the Five Mile River. Philip Dexter located Falmouth's first grist mill at its mouth around 1700, and by 1795 there were three mills along the river with a corresponding decline in fisheries. A "herring war" began in 1798 with a bylaw giving an elected committee the right to remove any obstructions to allow fish free passage from