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

Abstract

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
Volume94
Issue number5
Pages (from-to)745-751
ISSN0022-1112
DOIs
Publication statusPublished - 2019

Keywords

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

Cite this

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title = "Artificial lakes delay the migration of brown trout Salmo trutta smolts: a comparison of migratory behaviour in a stream and through an artificial lake",
abstract = "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.",
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author = "Michael Schwinn and Henrik Baktoft and Kim Aarestrup and Anders Koed",
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language = "English",
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Artificial lakes delay the migration of brown trout Salmo trutta smolts: a comparison of migratory behaviour in a stream and through an artificial lake. / Schwinn, Michael; Baktoft, Henrik; Aarestrup, Kim; Koed, Anders.

In: Journal of Fish Biology, Vol. 94, No. 5, 2019, p. 745-751.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Artificial lakes delay the migration of brown trout Salmo trutta smolts: a comparison of migratory behaviour in a stream and through an artificial lake

AU - Schwinn, Michael

AU - Baktoft, Henrik

AU - Aarestrup, Kim

AU - Koed, Anders

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - Salmo trutta

KW - artificial lake

KW - ground speed

KW - lowland stream

KW - salmonids

KW - wetland

U2 - 10.1111/jfb.13950

DO - 10.1111/jfb.13950

M3 - Journal article

VL - 94

SP - 745

EP - 751

JO - Journal of Fish Biology

JF - Journal of Fish Biology

SN - 0022-1112

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ER -