That is a big sac-a-lait.
I can't say for Sebago, but as a taxidermist I mount lot of large black crappies to 18 1/2 inches every year with one monster several years ago that was 20 or 21 inches. Typically even a stout fish like the one in the picture @ 15 inches is somehwhere in the 2 1/4 pound range give or take from my experience. A female full of eggs in the spring could be little more. Believe it or not the 20 or 21 inch crappie was only 3 1/4 pounds as it was an old lean fish.
What did it bite ?
anyone have an idea what a sebago 15 plus incher weighs, it looked to be 2.5 to 3 pounds
we did visually see some lakers in shallow warm water, seems to early with the water temps and the bright sun
visually as in you saw them with your eyes in shallow water? that is very surprising to me.
it was right on a shallow edge dropping to 30/40 feet, surface temps are still low 70's. saw 2 boats trolling there saterday, went and checked it sunday to see what they were doing. never seen a bent rod there though. only thing i can think off was bait may have been pushed up there earlier