Assessing the Hazard of Picloram to Cutthroat Trout

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Abstract
Water concentrations of picloram [an herbicide used in range management], 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 1300 .mu.g/l and reduced fry growth in concentrations above 610 .mu.g/l. The chemical had no adverse effect on fry in concentrations below 290 .mu.g/l. If persistent rainfall were to occur, resulting in continuous loss of picloram in runoff, the maximum allowable concentration might be much lower than 290 .mu.g/l.

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