Artificial lakes delay the migration of brown trout Salmo trutta smolts: a comparison of migratory behaviour in a stream and through an artificial lake

Michael Schwinn, Henrik Baktoft, Kim Aarestrup, Anders Koed*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


Juvenile salmonids experience high mortality when negotiating lentic waters during their downstream migration to the sea. The development of artificial lakes and wetlands in streams has become a widely used management tool to reduce nutrient load to coastal areas. Such wetlands may threaten anadromous populations. In this study we quantify net ground speed of downstream migrating brown trout Salmo trutta smolts in equally long stream and lake sections in a Danish lowland stream and artificial lake. This was done by passive integrated transponder telemetry in 2016 and 2017. Mean net ground speed in the stream section was 36.58 km day-1 and 0.8 km day-1 in the lake section. This decrease of net ground speed through the lake may lead to prolonged exposure to predators and probably contributes to high mortalities threatening anadromous populations.
Original languageEnglish
JournalJournal of Fish Biology
Issue number5
Pages (from-to)745-751
Publication statusPublished - 2019


  • Salmo trutta
  • artificial lake
  • ground speed
  • lowland stream
  • salmonids
  • wetland

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