River Allen (Truro)
The River Allen rises at Ventoneage (Cornish: Fentenyk, meaning little spring) north of St Allen and flows southwards through the Idless Valley into Truro. Here it joins the River Kenwyn to form the Truro River.
The river is home to healthy populations of Brown Trout (Salmo trutta), European Eel (Anguilla anguilla), Minnow (Phoxinus phoxinus) and Bullhead (Cottus gobio) also known as the ‘Miller’s Thumb. The lower tidal reaches also hold Bass (Dicentrarchus labrax), Grey Mullet (Chelon labrosus), and Flounder (Platichthys flesus). There is also a small run of Sea Trout (migratory Salmo trutta) into the river.