Stoneflies
Gammarids
Granite and mixed geology, small wild brown trout averaging six ounces, the river is heavily overgrown and rarely fished outside the small local circle. The Aughrim & District Trout Angling & Conservation Club tickets it together with the Ow and the lower Aughrim — three named waters, one connected system.
Hatches & food
EPA river-invertebrate monitoring across the Derry Water confirms mayflies (including Ephemera danica), stoneflies (with the larger Perla carlukiana present), an extensive caddis assemblage, chironomids and blackflies, plus freshwater shrimp and hoglice — evidence of a genuinely food-rich upland freestone.
- Mixed