Management of Atlantic Salmon (Salmo salar) Smolt in the River Shannon, Ireland
Proceedings of the International Symposium on Fishways '95
The Organizing Committee for International Symposium on Fishways '95 in Gifu
The River Shannon, Ireland, hydro-electric scheme is described. Catch statistics from smolt index traps, water temperature, and discharge during the smolt migration period are described for the years 1992-1995. No significant differences were found in the performance (measured as recapture rates in the Irish drift-net fishery and return rates to a trap) of coded wire-tagged smolt groups released by helicopter upstream and downstream of the generating station. Over three release years (1991-1993) the overall mortality associated with turbine passage was 8.5%. The significance of night-time generation during the peak period of smolt migration (20 April - 20 May) for the downstream passage of smolt through turbines is discussed.