A1 Refereed original research article in a scientific journal
Prevalence of stocked whitefish in River Kemijoki, Finland, inferred by micro X-ray fluorescence analysis of otoliths
Authors: Viktor Finnäs, Jan-Olof Lill, Yvette Heimbrand, Martina Blass, Timo Saarinen, Yann Lahaye, Erkki Jokikokko, Henry Hägerstrand
Publisher: WILEY
Publication year: 2020
Journal: Fisheries Management and Ecology
Journal name in source: FISHERIES MANAGEMENT AND ECOLOGY
Journal acronym: FISHERIES MANAG ECOL
Volume: 27
Issue: 5
Number of pages: 8
ISSN: 0969-997X
eISSN: 1365-2400
DOI: https://doi.org/10.1111/fme.12430
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/48477075
Micro X-ray fluorescence (mu-XRF) analysis of otoliths was evaluated as a method to estimate the proportion of stocked one-summer-old whitefish Coregonus lavaretus L. in catches of adult fish (n = 20) ascending the River Kemijoki to spawn. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis was applied as control. Polished otoliths were scanned with mu-XRF to obtain strontium maps that were used to infer visually the provenance of the whitefish. Thirteen of the fish showed signs of being stocked as one-summer-old fingerlings. LA-ICP-MS was applied to determine the elemental composition in a spot outside the core of the otolith. The results were largely consistent with the visual inspection of the mu-XRF mapped otoliths. In conclusion, mu-XRF mapping successfully identified whitefish stocked as one-summer-old fingerlings. The vast majority of whitefish returning to the River Kemijoki to spawn were stocked fish.
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