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Assessing the Hazard of Picloram to Cutthroat Trout

D. F. Woodward
Journal of Range Management
Vol. 32, No. 3 (May, 1979), pp. 230-232
DOI: 10.2307/3897129
Stable URL: http://www.jstor.org/stable/3897129
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Assessing the Hazard of Picloram to Cutthroat Trout
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Abstract

Water concentrations of picloram, comparable with those reported from field investigations, were used to simulate field exposures of cutthroat trout (Salmo clarki) to the herbicide. Picloram increased fry mortality in concentrations greater than 1,300 μg/l and reduced fry growth in concentrations above 610 μg/l. The chemical had no adverse effect on fry in concentrations below 290 μg/l. However, if persistent rainfall were to occur, resulting in continuous loss of picloram in runnoff, the maximum allowable concentration might be much lower than 290 μg/l.

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