Scuds and Sow Bugs are some of the most important food sources available to fish in many streams and rivers, especially in high nutrient environments like spring creeks and tailwaters. These bug are aquatic invertebrates but are not insects like most other trout food items. They are favored by big fish because they offer high nutrient content, including tons of protein for fast growth. These flies technically fall in the nymph category but unlike nymphs they remain in the water year round in one life stage. If you haven't tried to fish scuds or sowbugs you are missing out on the chance to imitate a favorite big trout food source.
