Brown trout avoidance of metals in water characteristic of the Clark Fork River, Montana

Canadian Journal of Fisheries and Aquatic Sciences
By: , and 

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Abstract

The avoidance response of brown trout (Salmo trutta) to mixtures of cadmium, copper, lead, and zinc was determined in water simulating the Clark Fork River, Montana. Effects of acidification on the avoidance response were also evaluated. Tests were conducted in a cylindrical chamber that received reference water at one end and metal-contaminated water at the other; a distinct boundary formed at the center where the chamber drained. A 1 × mixture of the four metals (Cd, 1.1 μg/L; Cu, 12 μg/L; Pb, 3.2 μg/L; and Zn, 55 μg/L) that was representative of the ambient metals concentrations of the Clark Fork River resulted in avoidance by brown trout. Brown trout also avoided 0.5×, 2×, 4×, and 10× mixtures but not a 0.1 × mixture. A reduction in pH from 8.0 to either 7.0, 6.0, or 5.0 resulted in significant avoidance. Avoidance reactions to metals, similar to those observed in our laboratory experiments, may contribute to the depression of brown trout populations in the Clark Fork River.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Brown trout avoidance of metals in water characteristic of the Clark Fork River, Montana
Series title Canadian Journal of Fisheries and Aquatic Sciences
DOI 10.1139/f95-794
Volume 52
Issue 9
Year Published 1995
Language English
Publisher NRC Research Press
Contributing office(s) Columbia Environmental Research Center
Description 7 p.
First page 2031
Last page 2037
Online Only (Y/N) N
Additional Online Files (Y/N) N