Author:
Gabrielsen Sven-Erik,Lennox Robert J.,Wiers Tore,Barlaup Bjørn T.
Abstract
AbstractSea-run brown trout (Salmo trutta) have a highly phenotypically plastic life history that allows them to be effective colonizers and competitors in freshwater. This paper documents a previously unknown spawning behaviour in a brackish, tidally influenced estuary 14 km from the mouth of the Vosso River, a major Atlantic salmon- and sea-run brown trout–producing river in western Norway. Putative spawning gravel was observed, and sea-run brown trout deposited eggs that hatched in April. Survival of recruits was high (> 95%) in the tidal spawning gravel. These areas are strongly tidally influenced with a peak of 23.17 psu recorded at the lowest spawning ground. The observation of spawning so far from the river mouth may be unique in such a system with a long estuary but provides important insight into the biology of sea trout. Invasion of pink salmon, also known to spawn in estuaries, may negatively affect the competitive balance of sea trout with other salmonids in rivers where sea trout populations rely on recruitment from these relatively extreme spawning areas. Restoration of estuaries that have been modified by dredging or channelization may be important to ensure quality and heterogenous habitat for sea trout spawning given that haline spawning grounds could contribute to population resilience.
Funder
NORCE Norwegian Research Centre AS
Publisher
Springer Science and Business Media LLC
Subject
Aquatic Science,Ecology, Evolution, Behavior and Systematics
Reference20 articles.
1. Bjerkens V, Golmen LG, Åtland Å (1998) Undersøkelse av vannkvalitet og overleving av laksesmolt i Bolstadfjorden. NIVA Report, available at: https://niva.brage.unit.no/niva-xmlui/bitstream/handle/11250/208344/3282_72dpi.pdf?sequence=1&isAllowed=y. Accessed 26 Sep 2021
2. Davidsen JG, Knudsen R, Power M, Sjursen AD, Rønning L, Hårsaker K et al (2017) Trophic niche similarity among sea trout Salmo trutta in central Norway investigated using different time-integrated trophic tracers. Aquat Biol 26:217–227
3. Gjelland KØ, Serra-Llinares RM, Hedger RD, Arechavala-Lopez P, Nilsen R, Finstad B et al (2014) Effects of salmon lice infection on the behaviour of sea trout in the marine phase. Aquacult Environ Int 5:221–233
4. Heard WR (1991) Life history of pink salmon. Pacific salmon life histories, 119–230
5. Järvi T, Holmgren K, Rubin JF, Petersson E, Lundberg S, Glimsäter C (1996) Newly-emerged Salmo trutta fry that migrate to the sea-an alternative choice of feeding habit? Nord J Freshw Res 72:52–56
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