LABORATORY FLOW-THROUGH BIOASSAYS OF FOUR FORESTRY INSECTICIDES AGAINST STREAM INVERTEBRATES

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Abstract
Continuous-flow laboratory bioassays were used to assess the acute toxicities of four formulated insecticides to representative stream invertebrates. Toxicities (48-h LC50) ranged from 3.2 to 7.4 μg/L for permethrin, from 39 to 269 μg/L for fenitrothion, from 478 to 2863 μg/L for aminocarb, and from 99 to 492 μg/L for mexacarbate. Slopes of the probit lines were similar for acetylcholinesterase inhibitors (fenitrothion, aminocarb, and mexacarbate), but slightly lower for permethrin. All test species responded to all of the insecticides at concentrations of 0.25 μg/L for permethrin, 10 μg/L for fenithrothion, and 25 μg/L for aminocarb and mexacarbate by drifting in the test chambers.