Definition of stonefly in English:



  • A slender insect with transparent membranous wings, the larvae of which live in clean running water. The adults are used as bait by fly fishermen.

    • ‘The natural diet of loch trout is more varied than most care to admit and be prepared for trout taking midge, stonefly, sedge, beetles, nymphs, olives and mayfly.’
    • ‘On many of the rocks were the empty cases of early season stoneflies that the river seems to support in large numbers.’
    • ‘Young Atlantic salmon in streams eat mainly the larvae of aquatic insects such as blackflies, stoneflies, caddisflies, and chironomids.’
    • ‘The Permian saw the appearance of stoneflies, true bugs, beetles, and caddisflies, among other groups.’
    • ‘Their findings can then be presented to government scientists for further investigation, or passed to national recording schemes for the three main groups of river insects: caddisflies, mayflies, and stoneflies.’