Abstract
Over the last years, insecticides less toxic and less persisting into mammalian organisms, such as pyrethroids, have been used. Some studies have indicated that these insecticides are highly active to nontarget aquatic organisms. Deltamethrin is a type II pyrethroid, is very toxic to crustaceans and fish even at low concentrations. It inhibits nicotinic acetylcholine receptors, channel vo…