The efficacy of air, sound and acoustic bubble screens in deflecting Atlantic salmon, Salmo salar L., smolts in the River Frome, UK

• Published in: Fisheries Management and Ecology
• Main Authors: WELTON, J. S., BEAUMONT, W. R. C., CLARKE, R. T.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2002
• Subjects: Atlantic salmon; Salmo salar
• Online Access: http://dx.doi.org/10.1046/j.1365-2400.2002.00252.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2400.2002.00252.x; https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2400.2002.00252.x

Atlantic salmon, Salmo salar L., smolts are vulnerable to entrainment in a variety of man‐made structures as they migrate downstream. The ability of acoustic bubble screens to deflect smolts from potential hazards was assessed. Screens were deployed, in turn, across one of the two identical channels through which the millstream of the River Frome flowed and the efficiency of these screen systems was tested by counting smolts by video recording in each channel. It was concluded that these screens deflected a significant number of smolts. Efficiencies were greater at night than in daylight because of smolt behaviour.