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One of the best places to find feeding trout in streams and rivers is in or along foam lines. What causes a foam line is the collection of the current or currents of the river or stream into one or more current line or seam. Along with the foam also comes anything else floating in water, including bugs. These foam lines become a veritable moving smorgasbord for trout, and they will line up for an easy meal. Rivers and streams rarely have a constant speed of current from bank to bank. Curves, obstruction etc. all cause differences in current speeds. Imagine if you will taking a bag of mini marshmallows and spreading evenly from bank to bank on a stream. As they float downstream they will all end congregating in lines of currents and not stay evenly spread across the water. Foam line Rainbow! Along with the gathering of the bugs all in a line the foam also produces some overhead cover for the trout which makes them a little more secure in their feeding. A lot of times when nymphing I use a white yarn indicator, this is not the wise choice for foam lines, bright orange, pink or yellow will be much easier to see. The same goes for the parachute post or wings of your dry fly if that’s what you’re fishing. Sometimes it’s hard to believe that the trout can see the bugs because the foam is so thick, but they do and they don’t seem to find feeding in it. So remember; "Where there’s foam there’s food and where there’s food there’s fish!"