Effects of Acid Rock Drainage on Stocked Rainbow Trout (Oncorhynchus mykiss): An In-Situ, Caged Fish Experiment |
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Authors: | Andrew S Todd Diane M McKnight Chris L Jaros Thomas M Marchitto |
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Institution: | (1) Institute of Arctic and Alpine Research, University of Colorado, University Campus Box 450, Boulder, CO 80309, USA |
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Abstract: | In-situ caged rainbow trout (Oncorhynchus mykiss) studies reveal significant fish toxicity and fish stress in a river impacted by headwater acid rock drainage (ARD). Stocked
trout survival and aqueous water chemistry were monitored for 10 days at 3 study sites in the Snake River watershed, Colorado,
U.S.A. Trout mortality was positively correlated with concentrations of metals calculated to be approaching or exceeding conservative
toxicity thresholds (Zn, Mn, Cu, Cd). Significant metal accumulation on the gills of fish stocked at ARD impacted study sites
support an association between elevated metals and fish mortality. Observations of feeding behavior and significant differences
in fish relative weights between study site and feeding treatment indicate feeding and metals-related fish stress. Together,
these results demonstrate the utility of in-situ exposure studies for stream stakeholders in quantifying the relative role of aqueous contaminant exposures in limiting stocked
fish survival. |
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Keywords: | Acid rock drainage Ecotoxicology In-situ exposure Rainbow trout |
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