Abstract
The concentration of phosphamidon that kills 50% of lobsters in 96 h (96-h LC50) at 12 C is 50 μg/liter and the lethal threshold is 18 μg/liter whether determined in static or running water tests. The 96-h LC50 at 4 C is 180 μg/liter and the lethal threshold is 28 μg/liter, or possibly as low as 18 μg/liter. Phosphamidon is 50–60 times less toxic to lobsters than fenitrothion.

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