In NH we catch them all year round, just have to adjust how you fish with the time of season and bait. Spring trolling with spinners, streamers in shallow water early morning. Summer they run a little deeper and larger bait or live bait. fall they hang around the thermocline depends on the lake how deep it is usually between 10 and 20 ft. Durring ice fishing I put a small minnow or smelt about 6-10 inches below the ice and cover the hole with a insulator on the tip up. Keeps them biting all year round just have to find out where they are in your lake or river and get the bai to them, they will eat!

Check Maine's DNR report. Also check the solunar calendar tables. They will show the best days to fish, and the major 2 hour peroids throughout the day.