These fish spend most of their lives at sea and return to rivers to spawn. In Maine populations have suffered since the extensive damming of rivers for power of the last couple o' hundred years. At Damariscotta (the river of little fish) there is an old "fish ladder" which allows the fish to make it past the dam. It is part way through extensive renovation (see http://www.damariscottamills.org/
Anyway, I popped up there this afternoon to see a friend and we took a look. Wrong lens/bit dark and raining mean some rubbish pics but you can see the fish at least. Loads of birds: hundreds of herring gulls and a swarm of osprey.