Routes and survival of anadromous brown trout Salmo trutta L. post-smolts during early marine migration through a Danish fjord system

Martin Lykke Kristensen*, Kim Birnie-Gauvin, Kim Aarestrup

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We examined the survival and progression rates of 101 anadromous brown trout Salmo trutta L. post-smolts from two Danish river systems, Karup and Simested, with acoustic telemetry as they migrated through a large Danish fjord system (the Limfjord). No fish were documented to residualize permanently within the fjord, and the minimum survival in the fjord was low (26%) while the mortality per km of migrated linear distance (0.8% km−1) was similar to that found in adjacent and smaller Danish fjords. Survival was positively correlated with length (P = 0.003) but not with condition and river of origin. The fjord has an eastern outlet into the Kattegat and a western outlet into the North Sea, but the western outlet did not exist until 1825. No fish left the fjord in the western direction in the study and all surviving fish (n = 20) left the fjord in the eastern direction. The results suggest that fish from rivers Karup and Simested may have over time become adapted for leaving the Limfjord in the eastern direction and that predation rates and environmental characteristics of the fjord are more important for the fjord's ability to function as a suitable growth habitat for post-smolts than size and the availability of food within it.
Original languageEnglish
JournalEstuarine, Coastal and Shelf Science
Volume209
Pages (from-to)102-109
ISSN0272-7714
DOIs
Publication statusPublished - 2018

Cite this

@article{718a0357fd6d4f6097249435e16cd07b,
title = "Routes and survival of anadromous brown trout Salmo trutta L. post-smolts during early marine migration through a Danish fjord system",
abstract = "We examined the survival and progression rates of 101 anadromous brown trout Salmo trutta L. post-smolts from two Danish river systems, Karup and Simested, with acoustic telemetry as they migrated through a large Danish fjord system (the Limfjord). No fish were documented to residualize permanently within the fjord, and the minimum survival in the fjord was low (26{\%}) while the mortality per km of migrated linear distance (0.8{\%} km−1) was similar to that found in adjacent and smaller Danish fjords. Survival was positively correlated with length (P = 0.003) but not with condition and river of origin. The fjord has an eastern outlet into the Kattegat and a western outlet into the North Sea, but the western outlet did not exist until 1825. No fish left the fjord in the western direction in the study and all surviving fish (n = 20) left the fjord in the eastern direction. The results suggest that fish from rivers Karup and Simested may have over time become adapted for leaving the Limfjord in the eastern direction and that predation rates and environmental characteristics of the fjord are more important for the fjord's ability to function as a suitable growth habitat for post-smolts than size and the availability of food within it.",
author = "Kristensen, {Martin Lykke} and Kim Birnie-Gauvin and Kim Aarestrup",
year = "2018",
doi = "10.1016/j.ecss.2018.05.015",
language = "English",
volume = "209",
pages = "102--109",
journal = "Estuarine, Coastal and Shelf Science",
issn = "0272-7714",
publisher = "Academic Press",

}

TY - JOUR

T1 - Routes and survival of anadromous brown trout Salmo trutta L. post-smolts during early marine migration through a Danish fjord system

AU - Kristensen, Martin Lykke

AU - Birnie-Gauvin, Kim

AU - Aarestrup, Kim

PY - 2018

Y1 - 2018

N2 - We examined the survival and progression rates of 101 anadromous brown trout Salmo trutta L. post-smolts from two Danish river systems, Karup and Simested, with acoustic telemetry as they migrated through a large Danish fjord system (the Limfjord). No fish were documented to residualize permanently within the fjord, and the minimum survival in the fjord was low (26%) while the mortality per km of migrated linear distance (0.8% km−1) was similar to that found in adjacent and smaller Danish fjords. Survival was positively correlated with length (P = 0.003) but not with condition and river of origin. The fjord has an eastern outlet into the Kattegat and a western outlet into the North Sea, but the western outlet did not exist until 1825. No fish left the fjord in the western direction in the study and all surviving fish (n = 20) left the fjord in the eastern direction. The results suggest that fish from rivers Karup and Simested may have over time become adapted for leaving the Limfjord in the eastern direction and that predation rates and environmental characteristics of the fjord are more important for the fjord's ability to function as a suitable growth habitat for post-smolts than size and the availability of food within it.

AB - We examined the survival and progression rates of 101 anadromous brown trout Salmo trutta L. post-smolts from two Danish river systems, Karup and Simested, with acoustic telemetry as they migrated through a large Danish fjord system (the Limfjord). No fish were documented to residualize permanently within the fjord, and the minimum survival in the fjord was low (26%) while the mortality per km of migrated linear distance (0.8% km−1) was similar to that found in adjacent and smaller Danish fjords. Survival was positively correlated with length (P = 0.003) but not with condition and river of origin. The fjord has an eastern outlet into the Kattegat and a western outlet into the North Sea, but the western outlet did not exist until 1825. No fish left the fjord in the western direction in the study and all surviving fish (n = 20) left the fjord in the eastern direction. The results suggest that fish from rivers Karup and Simested may have over time become adapted for leaving the Limfjord in the eastern direction and that predation rates and environmental characteristics of the fjord are more important for the fjord's ability to function as a suitable growth habitat for post-smolts than size and the availability of food within it.

U2 - 10.1016/j.ecss.2018.05.015

DO - 10.1016/j.ecss.2018.05.015

M3 - Journal article

VL - 209

SP - 102

EP - 109

JO - Estuarine, Coastal and Shelf Science

JF - Estuarine, Coastal and Shelf Science

SN - 0272-7714

ER -