What Is a Stone Fly for Fishing?

Stone flies are one of the most important groups of aquatic insects when it comes to fishing. They are found in both still and running water, and their larvae inhabit the bottom of rivers, streams, and lakes. Stone fly nymphs are crucially important for trout fishing as they form a significant portion of the trout’s diet.

Stone flies vary greatly in size and shape, but all have two pairs of wings that lay flat on their back when at rest. The larvae are usually dark brown or black in color, with a few lighter species available. They all have six legs, three on each side, and range from 1/2 inch to almost 3 inches long.

Stoneflies go through a complete metamorphosis from egg to adult. Females lay eggs directly into the water or onto wet rocks near shorelines where they will hatch into nymphs.

The nymphs then live in water for 2-3 years before they emerge as adults. During this time they feed on algae and other small aquatic organisms like mayfly nymphs or caddis fly larvae.

How to Fish With Stoneflies

Stone flies can be used as bait for catching trout and other fish species in both stillwaters and rivers. They can be fished using wet or dry flies that imitate their natural behavior—the stonefly larva crawling along the bottom of the river or lake—or by simply suspending them under a strike indicator or floatant-treated dry fly. To increase your chances of success, use an appropriate size and color pattern for your region’s local stonefly species.


Stoneflies are an essential part of fly fishing for trout as they form a major part of its diet. They vary greatly in size and color depending on species but can be used as bait when imitating their natural behavior with wet or dry flies. Learning how to effectively fish with stoneflies is essential if you want to increase your chances of success while fishing for trout!

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Lindsay Collins