Acute effects of suspended sediment angularity on juvenile coho salmon (Oncorhynchus kisutch)

Randal G Lake; Scott G Hinch

doi:10.1139/f99-024

journal article May 01, 1999

Acute effects of suspended sediment angularity on juvenile coho salmon (Oncorhynchus kisutch)

Randal G Lake Scott G Hinch

Canadian Journal of Fisheries and Aquatic Sciences Vol. 56 No. 5 pp. 862-867 · Canadian Science Publishing

View at Publisher Save 10.1139/f99-024

Abstract

To determine the roles of suspended sediment angularity and concentration as contributors to stress and mortality in salmonids, we exposed juvenile coho salmon (Oncorhynchus kisutch) to anthropogenically derived "extremely angular" and "round" silicate sediments over a range of concentrations in 96-h experiments. Stress responses (e.g., decreased leukocrit) were elicited by exposure to both sediment shapes when concentrations were >40 g·L-1, corresponding to the minimum concentration at which physical gill damage was observed. Extremely angular sediments also caused stress responses (e.g., elevated hematocrit, decreased leukocrit) at concentrations <41 g·L-1. However, we found no difference between sediment shapes in causing mortality at any sediment concentration. Further, mortalities were not observed until concentrations were about 100 g·L-1, a value that is about an order of magnitude greater than high natural concentrations in salmonid rivers. Natural fluvial suspended sediments cause fish stress and mortality at much lower concentrations than we found with our anthropogenically derived suspended sediments.

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Details

Published: May 01, 1999
Vol/Issue: 56(5)
Pages: 862-867
License: View

Authors

Cite This Article

Randal G Lake, Scott G Hinch (1999). Acute effects of suspended sediment angularity on juvenile coho salmon (Oncorhynchus kisutch). Canadian Journal of Fisheries and Aquatic Sciences, 56(5), 862-867. https://doi.org/10.1139/f99-024

Acute effects of suspended sediment angularity on juvenile coho salmon (Oncorhynchus kisutch)

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