Maine used to stock 3 different strains of browns: Seeforellen, Sandwich, and New Gloucester (their own hybrid strain). Not sure which ones they ended up sticking with but I think they were trying to phase out the New Gloucester strain due to genetic shortcomings.
I used to stock Spring spawning Rainbows in one of my farm ponds. But now I have to go to N.H. to get them and they do not allow it. cannot bring them across state line. Use to get them from North new Portland hatchery and they did reproduce some years and they got up to 10 lbs in 3 years wish the state would stock them.
For gills in Maine, you need to go further south, York county is infested with them. Pumpkinseeds get decent sized too. Though my biggest for both is 9-9.5”. I’ve only ever caught a few redbreasts, but this one was no slouch, bushy pike fly on size 2 hook
A lot of lakes in southern Maine are owned by people from out of state and are lived in only in summer months ,When ice fishing its very quite and peaceful maybe 1 camp out of 100. like being in a very remote area. a great way to spend a few hours a day.