Keywords: stream pyrethroids Systems: stream Substances: Bifenthrin (OXCDWLBJSLVWHB-LKRLXIKPSA-N) Acrinathrin (YLFSVIMMRPNPFK-WEQBUNFVSA-N) Tefluthrin (ZFHGXWPMULPQSE-SZGBIDFHSA-N)