Alberto;

I'm in southern Maine, and I tie tandem trolling flies ( front hook down, rear hook up), #4 R4-9672 Mustad. The most popular flies here are King Smelt, Arnold, Govenor Aiken, Mickey Finn, and the Sneaker.
Full sinking line is a must, right now about 15' down. You also have to tie them real scimpie (less is more). If you are buying them, be prepared to thin them with nippers.
The browns and rainbows have been attacking them hard. Haven't caught a Landlock so far this year.

Good Luck


P.S.
I always paint eyes on my flies, not sure if it makes any difference, but I feel better ha ha ha