[The characteristics of the action on hydrobionts of the insecticide Valexon].

The effect of organophosphorus insecticide, valexon, has been investigated on hydrobionts from different taxonomic groups. Survival, locomotor activity, oxygen consumption and free radical spectra were determined. High sensitivity to the effect of the insecticide was found in Daphnia, due to the specific action of it on locomotor and respiratory functions, which are closely related in crustaceans.