Movements of Atlantic salmon migrating upstream through a fish-pass complex in Scotland |
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| Authors: | A R D Gowans J D Armstrong I G Priede S Mckelvey |
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| Institution: | Fisheries Research Services Freshwater Laboratory, Faskally, Pitlochry, Perthshire PH16 5EE, UK,;University of Aberdeen, Department of Zoology, Tillydrone Avenue, Aberdeen, UK,;Conon District Salmon Fisheries Board c/o Finlayson Hughes, 43 Church Street, Inverness IV1 1DR, UK |
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| Abstract: | Abstract – Movements of adult Atlantic salmon were tracked through a series of four fish passes and an impoundment on the River Conon system, Northern Scotland. Proportions of fish passing individual obstructions ranged from 63 to 100%. The cumulative effect was that only 4 of the 54 tagged fish reached the spawning areas. The fish were delayed for 1–41 days at a pool-and-overfall ladder and 1–52 days at a Borland fish lift. The fish swam through a 10 km long reservoir at 0.21–1.16 km·h?1. A total of 13 fish negotiated a 2.5 km long, 3 m diameter diversion tunnel through a mountain to their home river. High levels of electromyogram (EMG) activity were recorded during ascent of a pool-and-overfall fish ladder, indicating that high energy demanding burst swimming was required. |
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| Keywords: | salmon migration fish-pass complex radio telemetry electromyogram telemetry |
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