Large stonefly

Freshwater Habitats

Forests and Woodlands, Freshwater Habitats

Adult large stonefly may be attracted to light traps at night, whereas nymph large stonefly do not require food traps as they can be found in their natural stream habitats.

The eggs of large stonefly are deposited in clean, well-oxygenated water, often in fast-flowing streams with rocky substrates. The nymphs continue their development in similar aquatic environments, hiding under stones or debris, where they feed and grow. They are commonly found in the hyporheic zone, a dynamic region beneath and alongside the stream bed. As they progress to adulthood, the nymphs migrate closer to the water's edge. Adult large stonefly are typically found near the same freshwater bodies where they developed as nymphs but move to the surrounding terrestrial vegetation, stones, or logs. To locate each development stage of large stonefly, search along riverbanks with clean, fast-moving water and check under rocks within the stream and on nearby riparian vegetation.

The best time to find adult large stonefly is usually at night when they are most active, and during their flight season which often coincides with late spring to summer. nymph large stonefly can be found throughout the year in the water.

Adult large stonefly prefer to emerge and are easier to find in mild to warm weather without heavy winds or rain. nymph large stonefly can be collected from streams regardless of weather but may be easier on days when the water is clearer and calmer.