The Schultzy's Red Eye Leech is a solid choice anywhere crayfish are present; trout, carp, bass and even pike have also succumbed to this fly pattern.
Zinger Fishing uses the Schultzy's Red Eye Leech in all bodies of waters, from streams, rivers, lakes and even saltwater. I suggest having a minimum of 3 in your fly fishing case at all times.
Huge fish are caught with the hook size #6.