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Acid Deposition and Effects in Nordic Europe. Damage to Fish Populations in Scandinavia Continue to Apace

  • B. O. Rosseland
  • O. K. Skogheim
  • I. H. Sevaldrud
Conference paper

Abstract

Although the decline in fish populations due to acidic water in Norway started as early as in the 1920’s the most rapid losses appeared during the 1960–70’s. Until 1978, the populations of Atlantic salmon had disappeared from the southernmost part of Norway, and in these areas, more than half of the brown trout populations had been lost. Today, in spite of no increase in acid depositions, the fishery problems seems to continue at the same speed. Data based on interviews of the local fish authority shows that lakes still holding a fish population in the late 70’s, have experienced a 30% loss of brown trout populations and a 12% loss of perch in the period 1978–1983. This trend have been confirmed by testfishing in lake systems having long data series. Salmon rivers on the western coast of Norway have experienced several episodes of fish kills due to rapid changes in water quality. These fish kills have mainly affected smolts of Atlantic salmon. Spawning migrating salmon on entering their acidified home river have also been affected. In Sweden, several salmon populations along the western coast have been lost due to acidification with no positive trends so far in the 1980’s. Areas in central Sweden and in some high mountain areas are still experiencing a continuous and increasing acidification with detrimental effects on invertebrates and fish.

In Finland, an increase in acidic deposition during the last decades have occured, leading to acidification in the most sensitive freshwater systems. Although some acidified freshwater lakes are reported to have lost their fish stocks, few data on fish population effects are available.

Keywords

Chemical Oxygen Demand Water Chemistry Atlantic Salmon Brown Trout Fish Population 
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 Science+Business Media Dordrecht 1986

Authors and Affiliations

  • B. O. Rosseland
    • 1
  • O. K. Skogheim
    • 1
  • I. H. Sevaldrud
    • 1
  1. 1.Directorate for Nature and ManagementFish Research DivisionTrondheimNorway

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