SS1.02 Geochemical Tracers in Calcified Structures: Implications for Fisheries Research
Date: Tuesday, June 11, 2002
Time: 2:30:00 PM
Location: Carson A
 
SanbornMS, University of Victoria, Victoria , Canada, msanborn@uvic.ca
Telmer, K, , University of Victoria, Victoria, Canada, ktelmer@uvic.ca
 
HIGH RESOLUTION ANALYSIS OF FISH OTOLITHS BY LASER ABLATION ICP-MS
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One of the analytical challenges in elemental analysis of fish otoliths is obtaining high precision, high resolution data. Inductively coupled plasma mass spectrometry (ICP-MS), coupled with laser ablation sample introduction, provides ability to analyze trace elements in solid samples at spatial scales ranging from 10-50 microns. By manipulating the operating conditions of the ICP-MS and the laser ablation system, high resolution data across the growth bands of the otolith can be obtained. The use of laser line scans was tested using a series of standard reference materials, and tracking the laser across these chemically distinct regions. Sr /Ca ratios across the otoliths of Chum salmon caught at Goldstream Park, southern Vancouver Island, were obtained using this technique and show a surprising pattern of systematically increasing and decreasing ratios throughout the life of the fish. Similar patterns were found for the Mn/Ca, and Zn/Ca ratios. This suggests a yearly cycle such as movement of the fish from open ocean to coastal environments.