The genus Ephemerella mayfly, or pale morning dun represents the largest mayfly hatch in North America, both in sheer numbers of insects and the number of rivers that they are found in. The Etha Wing Pale Morning Dun Emerger should be fished with floatant applied only to the wings of the fly. The rest of the fly will sink, giving a trout the appearance that the pmd is hatching. Trout love to eat emergers because they are defenseless and an easy meal.