Pyrethroids are insecticides with high biological activity and low dose application rates, characterized by low water solubility and strong sorptive properties, which reduce their bioavailability in natural environments (Davies, 1985). They are also relatively photolabile
Because of increased use of these compounds, concern over their possible ecological non-target effects has increased Aquatic insects are inherently susceptible to pyrethroids, but the mechanism behind their extreme sensitivity to these compounds is not completely clear