Behaviour of adult sea trout Salmo trutta that survive or die at sea

Martin Lykke Kristensen*, David Righton, Diego del Villar-Guerra, Henrik Baktoft, Kim Aarestrup

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We tagged 125 sea trout kelts (460–925 mm) in seven Danish rivers with positively buoyant DSTs. Fifty-three (42%) tags were recovered, enabling a comparison of behaviour in kelts that survived the marine period and kelts that did not. Data revealed an estimated mean survival time at sea of 14.3 days (range 1–65 days) for fish that died at sea. Fish that did not survive had lower weight/length ratios when tagged than survivors (P = 0.005) but exhibited a similar diel diving pattern while at sea. Both surviving and non-surviving fish gradually increased diving activity and the daily visited maximum depths after sea entry, but some performed fewer dives and resided in shallower depths than others. This difference was pronounced when comparing surviving fish (most active divers) with fish caught by anglers (least active divers). The results show that the first weeks at sea are critical for kelt survival and that physical status of kelts may affect behaviour and probability of survival. The preference for shallower waters and less diving activity in some individuals indicate that coastally based fisheries and recreational angling may select against specific behavioural phenotypes which should be investigated more intensively.
Original languageEnglish
Article number106310
JournalEstuarine, Coastal and Shelf Science
Volume227
ISSN0272-7714
DOIs
Publication statusPublished - 2019

Keywords

  • Behavior
  • Kelt
  • Sea trout
  • Survival
  • Telemetry

Cite this

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title = "Behaviour of adult sea trout Salmo trutta that survive or die at sea",
abstract = "We tagged 125 sea trout kelts (460–925 mm) in seven Danish rivers with positively buoyant DSTs. Fifty-three (42{\%}) tags were recovered, enabling a comparison of behaviour in kelts that survived the marine period and kelts that did not. Data revealed an estimated mean survival time at sea of 14.3 days (range 1–65 days) for fish that died at sea. Fish that did not survive had lower weight/length ratios when tagged than survivors (P = 0.005) but exhibited a similar diel diving pattern while at sea. Both surviving and non-surviving fish gradually increased diving activity and the daily visited maximum depths after sea entry, but some performed fewer dives and resided in shallower depths than others. This difference was pronounced when comparing surviving fish (most active divers) with fish caught by anglers (least active divers). The results show that the first weeks at sea are critical for kelt survival and that physical status of kelts may affect behaviour and probability of survival. The preference for shallower waters and less diving activity in some individuals indicate that coastally based fisheries and recreational angling may select against specific behavioural phenotypes which should be investigated more intensively.",
keywords = "Behavior, Kelt, Sea trout, Survival, Telemetry",
author = "Kristensen, {Martin Lykke} and David Righton and Villar-Guerra, {Diego del} and Henrik Baktoft and Kim Aarestrup",
year = "2019",
doi = "10.1016/j.ecss.2019.106310",
language = "English",
volume = "227",
journal = "Estuarine, Coastal and Shelf Science",
issn = "0272-7714",
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}

Behaviour of adult sea trout Salmo trutta that survive or die at sea. / Kristensen, Martin Lykke; Righton, David; Villar-Guerra, Diego del; Baktoft, Henrik; Aarestrup, Kim.

In: Estuarine, Coastal and Shelf Science, Vol. 227, 106310, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Behaviour of adult sea trout Salmo trutta that survive or die at sea

AU - Kristensen, Martin Lykke

AU - Righton, David

AU - Villar-Guerra, Diego del

AU - Baktoft, Henrik

AU - Aarestrup, Kim

PY - 2019

Y1 - 2019

N2 - We tagged 125 sea trout kelts (460–925 mm) in seven Danish rivers with positively buoyant DSTs. Fifty-three (42%) tags were recovered, enabling a comparison of behaviour in kelts that survived the marine period and kelts that did not. Data revealed an estimated mean survival time at sea of 14.3 days (range 1–65 days) for fish that died at sea. Fish that did not survive had lower weight/length ratios when tagged than survivors (P = 0.005) but exhibited a similar diel diving pattern while at sea. Both surviving and non-surviving fish gradually increased diving activity and the daily visited maximum depths after sea entry, but some performed fewer dives and resided in shallower depths than others. This difference was pronounced when comparing surviving fish (most active divers) with fish caught by anglers (least active divers). The results show that the first weeks at sea are critical for kelt survival and that physical status of kelts may affect behaviour and probability of survival. The preference for shallower waters and less diving activity in some individuals indicate that coastally based fisheries and recreational angling may select against specific behavioural phenotypes which should be investigated more intensively.

AB - We tagged 125 sea trout kelts (460–925 mm) in seven Danish rivers with positively buoyant DSTs. Fifty-three (42%) tags were recovered, enabling a comparison of behaviour in kelts that survived the marine period and kelts that did not. Data revealed an estimated mean survival time at sea of 14.3 days (range 1–65 days) for fish that died at sea. Fish that did not survive had lower weight/length ratios when tagged than survivors (P = 0.005) but exhibited a similar diel diving pattern while at sea. Both surviving and non-surviving fish gradually increased diving activity and the daily visited maximum depths after sea entry, but some performed fewer dives and resided in shallower depths than others. This difference was pronounced when comparing surviving fish (most active divers) with fish caught by anglers (least active divers). The results show that the first weeks at sea are critical for kelt survival and that physical status of kelts may affect behaviour and probability of survival. The preference for shallower waters and less diving activity in some individuals indicate that coastally based fisheries and recreational angling may select against specific behavioural phenotypes which should be investigated more intensively.

KW - Behavior

KW - Kelt

KW - Sea trout

KW - Survival

KW - Telemetry

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DO - 10.1016/j.ecss.2019.106310

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JO - Estuarine, Coastal and Shelf Science

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ER -