Two-year spawning migration as a life history strategy of sea trout

Abstract

In this study we used radio-telemetry derived data of riverine movements and spawning migration behaviour of wild sea trout tagged in a large, northern Baltic Sea river system, the Tornionjoki River. Tracking results indicate that both immature and mature trout utilize the freshwater environments for overwintering, and that previous spawning experience and age of tagged individuals were important for the maturation likelihood and subsequent direction of migration (mature spawners migrated upstream, immature fish returned to sea). The results indicate that the population has adopted a two-year spawning migration cycle, where individuals overwinter in-river both pre- and post-spawning. The prolonged freshwater stay of sea trout migrants needs to be taken into consideration in management to ensure adequate protection of both immature and mature sea trout.

General information

Title of Dataset: Two-year spawning migration as a life history strategy of sea trout (Salmo trutta L.)
DOI: doi: 10.17632/rjxmmmvbvs.1

Contact Information:
Principal Investigator Contact Information Name: Linus Lähteenmäki
Institution: Åbo Akademi University Address: Aurum, Henriksgatan 2–20520 Åbo, Finland, Email: [e-mail], ORCID:https://orcid.org/0000-0002-3931-3595

Date of data collection (approximate date): 01-04-2018 - 31-12-2021
Geographic location of data collection: Tornionjoki River system (65°46 N, 24°07 E)

Information about funding sources that supported the collection of the data: This study was funded by the Lapland´s Centre for Economic Development, Transport and the Environment, the Finnish–Swedish Transboundary River Commission, the Swedish Agency for Marine and Water Management, Natural Resources Institute Finland, Kempestiftelserna, Swedish University of Agricultural Science, Åbo Akademi University and Svenska Kulturfonden.

Recommended citation for this dataset: Lähteenmäki, L., Huusko, R., Hellström, G., Snickars, M., & Romakkaniemi, A. (in prep.) Data from: Two-year spawning migration as a life history strategy of sea trout (Salmo trutta L.) in large, high latitude river systems. Mendeley Data, V1, doi: 10.17632/rjxmmmvbvs.1.

All datasets used in the data analysis and generation of the visualizations for this study are provided in this repository. Please view the "READ ME" file For more detailed information on dataset contents