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Migration problems of Atlantic salmon (Salmo salar L.) in flow regulated rivers

Rivinoja, Peter (2005). Migration problems of Atlantic salmon (Salmo salar L.) in flow regulated rivers. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2005:114
ISBN 91-576-6913-9
[Doctoral thesis]

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Migration patterns of adult Atlantic salmon (Salmo salar) and smolts of salmon and brown trout (Salmo trutta) were studied in the flow controlled areas of two northern Swedish rivers. Fish behaviour and migration success at passages of various hydropower facilities were evaluated in different flow regimes. In addition, the impacts of the power-stations on the salmon populations were modelled. On average, 30% (annual mean 0-47%) of the upstream migrating salmon that were captured at the mouth of Umeälven and marked with radio-, PIT- or Carlin-tags in 1995-2005 (n = 2651), reached the fish-ladder 32 km upstream. The migration took, on average, 44 days from the river mouth to the fish-ladder. Salmon were hindered or delayed at the power-station outlet, waterfalls and the fish-ladder area. At the turbine outlet area, salmon generally responded to increased bypass flows by upstream migration. In total, a 70 % average loss of potential spawners to the catchment area was estimated. Predictions based on population modelling showed that if 75 % of the females passed the regulated section successfully and reached spawning areas in the tributary Vindelälven, the population could increase by about 500 % over a ten-year period. Radio-tagged smolts (n = 206) of Atlantic salmon and brown trout released upstream of the power-stations at Umeälven and Piteälven in 2002-2004 migrated downstream in the main flows at a speed of about 2 body length s-1, eventually leading them to the turbine intakes. Migrating smolts were observed surface oriented at depths of 1-3 m. Flow modelling estimated relatively low fish guidance efficiencies for the spillways at natural flows. About 13 % of the smolts at Piteälven were hindered as they approached the power-station, and mortality of smolts at turbine passage was positively related to body size. By using the data for radio-tagged smolts and data from Carlin-tagged smolts (n = 7450) in 1998-1999, the overall average mortality for smolts at the power-station was estimated to 17%. Population modelling predicted a potential increase in the escapement return from 5-30 % to 70-120 % in ten years if the smolts had no losses as they passed the power-station.

Authors/Creators:Rivinoja, Peter
Title:Migration problems of Atlantic salmon (Salmo salar L.) in flow regulated rivers
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :November 2005
Number of Pages:36
ALLPapers I-VI This thesis is based on the following papers, which will be refereed to by their Roman numerals: I. Rivinoja, P., McKinnell, S. & Lundqvist, H. 2001. Hindrances to upstream migration of Atlantic salmon (Salmo salar) in a northern Swedish river caused by a hydroelectric power-station. Regulated rivers: Research & Management 17:101-115. II. Lundqvist, H., Rivinoja, P., Leonardsson, K. & McKinnell, S. Upstream passage problems for wild Atlantic salmon (Salmo salar) in a flow controlled river and its effect on the population. Manuscript. III. Leonardsson, K., Belyaev, Y., Rivinoja, P. & Lundqvist, H. Modelling upstream migration of Atlantic salmon as a function of environmental variables. Manuscript. IV. Rivinoja, P., Leonardsson, K. & Lundqvist, H. Migration success and migration time of gastrically radio-tagged versus PIT-tagged adult Atlantic salmon. Journal of Fish Biology (Accepted). V. Rivinoja, P., Kiviloog, J., Östergren, J., Brydsten, L., Leonardsson, K. & Lundqvist, H. Migration of Atlantic salmon (Salmo Salar) and Brown trout (Salmo trutta) smolt at flow regulated areas in two northern Swedish rivers. Submitted manuscript. VI. Rivinoja, P., Leonardsson, K. & Lundqvist, H. Size dependent power-station induced mortality of smolts (Salmo sp.) and the potential effects on the spawning stock. Submitted manuscript.
Place of Publication:Umeå
ISBN for printed version:91-576-6913-9
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:M Aquatic sciences and fisheries > M40 Aquatic ecology
Subjects:Not in use, please see Agris categories
Agrovoc terms:salmo salar, atlantic salmon, salmo trutta, animal migration, rivers, water power, electrical energy, environmental impact, animal population, models, telemetry, sweden
Keywords:spawning migration, smolt, power-station, turbine outlet, bypass channel, fish-ladder, passage success, population model, radio tag
Permanent URL:
ID Code:987
Department:(NL, NJ) > Institutionen för vattenbruk (990101-061231)
Deposited By: Peter Rivinoja
Deposited On:23 Nov 2005 00:00
Metadata Last Modified:02 Dec 2014 10:08

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