Stoneflies
Gammarids
The bedrock is Devonian Old Red Sandstone (the Caha Mountain Formation). It is CLOSED to salmon and sea-trout angling for 2026 (zero harvest quota under the tagging scheme), and is listed here for completeness rather than as a place to fish. Atlantic salmon are genuinely present — Inland Fisheries Ireland's WFD electrofishing survey found juvenile salmon, brown trout and eels, with salmon the most abundant species at the survey site about 2 km north of Adrigole, in glide-dominated water over boulder, cobble, gravel and sand. But fish presence is not angling permission: do not plan a salmon trip here in 2026. Monitor IFI bulletins for any change in future seasons. Atlantic salmon and sea trout are managed under IFI's Wild Salmon & Sea Trout Tagging Scheme — many rivers are catch-and-release and harvest is allowed only where a confirmed surplus exists, so check the river's current status before fishing.
EPA freshwater monitoring on the Adrigole River confirms mayflies, stoneflies, caddis, aquatic diptera (blackfly and non-biting midges) and freshwater crustaceans such as hoglice are all present in the riverbed community. This is food-presence evidence from kick samples, not a confirmed hatch or rise pattern.
- Old red sandstone