Stoneflies are among the oldest orders of insects on the planet. All their life is spent in and around water and that makes them an obvious prey to many fish species such as brown trout, rainbow trout and char. They are among the first large insects to hatch in the spring. The nymphs are most important to fly fishermen.
Stonefly Nymph 4 Black
Stoneflies are found all over the world. No matter where you are, they have some things in common. They need clean freshwater to survive and they are only found in moving water.
Often called the "year-a-round-fly", stonefly nymphs are active all year and are important due to this. They are rarely of huge importance during a hatch as most species just crawl along the bottom until they reach the edge of the shoreline. That being said, fish will feed on them all year. The larger sized stonefly nymphs will seldom be ignored by a hungry trout. They also work well as attractor/searching patterns.
We recommend you to use a J:son Swivel but they are not necessary unless using J:son flies in size 1 and 2.
Stoneflies inhabit moving waters, such as rivers and creeks, but can somemtimes be found in areas of lakes where currents or waves makes the water move.
They need clean water with a lot of oxygen for their survival and are often found close to the shore, both as nymphs and as adults.
The life cycle consists of three stages. The egg, the nymph and the adult stonefly.