Elemental signatures in otoliths of hatchery rainbow trout (Oncorhynchus mykiss): distinctiveness and utility for detecting origins and movement
Daniel K Gibson-Reinemer, Brett M Johnson, Patrick J Martinez, Dana L Winkelman, Alan E Koenig, Jon D Woodhead
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES | NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS | Published : 2009
Otolith chemistry in freshwater has considerable potential to reveal patterns of origin and movement, which would benefit traditional fisheries management and provide a valuable tool to curb the spread of invasive and illicitly stocked species. We evaluated the relationship between otolith and water chemistry for five markers (Ba/Ca, Mn/Ca, Sr/ Ca, Zn/Ca, and 87Sr/86Sr) in rainbow trout (Oncorhynchus mykiss) using the existing hatchery system in Colorado and Wyoming, USA, to provide controlled, seminatural conditions. Otolith Ba/Ca, Sr/Ca, and 87Sr/86Sr reflected ambient levels, whereas Mn/Ca and Zn/Ca did not. Using only the markers correlated with water chemistry, we classified fish to the..View full abstract
Two anonymous reviewers and the associate editor provided helpful reviews. We thank the CDOW and Wyoming Game and Fish managers and hatchery personnel for their cooperation and assistance. John Stednick, Colorado State University, provided valuable guidance. Allan Shiller, University of Southern Mississippi, analyzed water and feed samples. Steven Campana, Fisheries and Oceans Canada, gave helpful advice regarding water and dietary contributions to otolith chemistry. Larry Scott, Colorado Geological Survey, provided geologic map data. Financial support was provided by the Whirling Disease Initiative, CDOW Law Enforcement and Aquatic sections, and the West Denver Chapter of Trout Unlimited.