For skinning and field dressing - 4 inch custom drop point.
For boning out and processing - a 5 inch Forester flex blade and an 8 inch Forester slicing style.
Trout and birds - a 3 inch custom spear point and / or a pair of game shears.
Fish filleting - Rapalla.
I do not like folding knives for cleaning game. I always have a three blade Case Stockman for general purpose use.