SS1.02 Geochemical Tracers in Calcified Structures: Implications for Fisheries Research
Date: Tuesday, June 11, 2002
Time: 11:15:00 AM
Location: Carson A
 
OutridgePM, Geological Survey of Canada, Ottawa, Canada, outridge@nrcan.gc.ca
Chenery, S, R, British Geological Survey, Keyworth, United Kingdom, srch@bgs.ac.uk
Babaluk, J, A, Fisheries and Oceans Canada, Winnipeg, Canada, bablukj@dfo-mpo.gc.ca
Reist, J, M, Fisheries and Oceans Canada, Winnipeg, Canada, reistj@dfo-mpo.gc.ca
 
ANALYSIS OF SR ISOTOPES IN ANNULI OF FISH OTOLITHS AND SCALES USING LASER ABLATION MULTICOLLECTOR ICP-MASS SPECTROMETRY
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Because the calcifed tissues of fish grow incrementally, the movements of fish between habitats with different Sr isotope ratios may be recorded as chronological micro-spatial isotopic variations in otoliths and scales. In this pilot study, laser ablation multicollector inductively coupled plasma mass spetrometry (LA-MC-ICPMS) was applied to the analysis of Sr abundance and 87Sr/86Sr in annuli of the scales of anadromous sockeye salmon and the otoliths of anadromous Dolly Varden char. Duplicate analyses of different sides of the same otoliths, and different otoliths from the same char, gave reproducible results overall, which suggests that LA-MC-ICPMS can be employed reliably in these tissues. However, there was evidence of lateral asymetry among otoliths which incorporated minor Sr isotope changes in one otolith but not the other. New information about fish life-history which could not be gained from the Sr concentration data alone include evidence of complete over-winter residence of char in freshwater, and unexpected freshwater residence of sockeye salmon during putatively marine periods of life.