A major advantage of having tungsten fishing beads incorporated into your favorite fly patterns is that they provide an element of flash to fly patterns by reflecting sunlight that has penetrated the water's surface.
A trout's diet naturally consists of approximately 90 percent aquatic
insects so anything that you can do to your favorite nymph pattern to
help get the trout's attention will pay big dividends. When tungsten fishing beads
nymph anglers need to understand how fast a fly is going to sink.
Experimenting with leader lengths and different sizes and types of
beads will be needed to understand how fast the flies will sink. Using
the countdown method after the cast will accurately let the fly angler
know what level of the water column he or she is fishing.
In most cases when presenting flies to fishing holding in deep holes
the smaller more aggressive fish will strike the fly closer to the
surface. Getting the fly down deep and rolling it along the bottom will
improve your chances of hooking the real lunker in the hole.