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Polar Biology

, Volume 24, Issue 4, pp 270–275 | Cite as

Seawater tolerance in first-time migrants of anadromous Arctic charr (Salvelinus alpinus)

  • Odd A. Gulseth
  • Kjell J. Nilssen
  • Martin Iversen
  • Bengt Finstad
Original Paper

Abstract

Anadromous juvenile Arctic charr (Salvelinus alpinus) were caught in the Sila River (66°21′N, 13°10′E, Nordland County, Norway) by use of a fish trap during their migration towards the sea in May/June. The absence of tags (not captured before) and examination of otoliths from sacrificed fish revealed that none of the experimental charr had previously encountered seawater. During 4 days of exposure to seawater, only minor changes in blood plasma osmolality, and blood plasma concentrations of Na+, Cl and Mg2+ were detected. An increase in Na+-K+-ATPase activity was measured during the exposure period. These results verified that first-time migrants exhibit hypoosmoregulatory capacity similar to that of smoltified Atlantic salmon (Salmo salar). Accordingly, the Arctic charr first-time migratory behaviour, including late descent and a possible stay within an estuary, cannot be taken as evidence of a poorly developed seawater tolerance.

Keywords

Atlantic Salmon Arctic Charr Plasma Osmolality Salvelinus Alpinus Anadromous Arctic Charr 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 2000

Authors and Affiliations

  • Odd A. Gulseth
    • 1
  • Kjell J. Nilssen
    • 1
  • Martin Iversen
    • 2
  • Bengt Finstad
    • 3
  1. 1.Brattøra Research Center, Department of Zoology, Norwegian University of Science and Technology, 7491 TrondheimNorway
  2. 2.Norwegian Directorate of Fisheries, Fisheries Advisory Service, P.O. Box 323, 8001 BodøNorway
  3. 3.Norwegian Institute for Nature Research, Tungasletta 2, 7485, TrondheimNorway

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