Hydrobiologia

, Volume 582, Issue 1, pp 99–107

Fjord migration and survival of wild and hatchery-reared Atlantic salmon and wild brown trout post-smolts

  • Eva B. Thorstad
  • Finn Økland
  • Bengt Finstad
  • Rolf Sivertsgård
  • Núria Plantalech
  • Pål Arne Bjørn
  • R. Scott McKinley
Fish Telemetry

Abstract

The behaviour of wild (n = 43, mean LT = 152 mm) and hatchery-reared (n = 71, mean LT = 198 mm) Atlantic salmon and wild anadromous brown trout (n = 34, mean LT = 171 mm) post-smolts with acoustic transmitters was compared in a Norwegian fjord system. There was no difference in survival between wild and hatchery reared salmon from release in the river mouth to passing receiver sites 9.5 km and 37.0 km from the release site. Mortality approached 65% during the first 37 km of the marine migration for both groups. There was no difference between wild and hatchery-reared salmon either in time from release to first recording at 9.5 km (mean 135 and 80 h), or in the rate of movement through the fjord (mean 0.53 and 0.56 bl s−1). Hatchery-reared salmon reached the 37 km site sooner after release than the wild salmon (mean 168 and 450 h), but rate of movement in terms of body lengths per second did not differ (mean 0.56 and 0.77 bl s−1). The brown trout remained a longer period in the inner part of the fjord system, with much slower rates of movement during the first 9.5 km (mean 0.06 bl s−1).

Keywords

Acoustic telemetry Fjord migration Swimming speed Salmo trutta Salmo salar 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Eva B. Thorstad
    • 1
  • Finn Økland
    • 1
  • Bengt Finstad
    • 1
  • Rolf Sivertsgård
    • 2
  • Núria Plantalech
    • 1
  • Pål Arne Bjørn
    • 3
  • R. Scott McKinley
    • 4
  1. 1.Norwegian Institute for Nature Research (NINA)TrondheimNorway
  2. 2.Norwegian College of Fishery ScienceUniversity of TromsøTromsøNorway
  3. 3.Norwegian Institute of Fisheries and Aquaculture ResearchTromsøNorway
  4. 4.West Vancouver LaboratoryThe University of British ColumbiaBritish ColumbiaCanada

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