||Effects of Methoxychlor on Aquatic Biota.
Mern, James W. ;
Eisel, Paul J. ;
||Institute for Fisheries Research, Ann Arbor, Mich.
||EPA-18050-DLO; 04553,; R3-73-046
Aquatic animals ;
Toxic tolerances ;
Animal physiology ;
Gammarus pseudolimnaeus ;
Orconectes virilis ;
Pimephales promelas ;
Perca flavescens ;
Water pollution effects(Animals)
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Continuous-flow bioassays yielded 96-hour TL50 values for invertebrates ranging from 0.61 micrograms/liter for Gammarus pseudolimnaeus to 7.05 micrograms/liter for Orconectes virilis. Fathead minnows (Pimephales promelas) and yellow perch (Perca flavescens) had 96-hour TL50 values of 8.63 and 2.22 micrograms/liter respectively. Hatching of fathead minnow eggs was inhibited at all levels of exposure tested between 1.0 and 0.125 micrograms/liter. There was no spawing at 2 micrograms/liter. Growth of yellow perch was retarded at all levels tested between 5.0 and 0.625 micrograms/liter. All perch died at 10 micrograms/liter during the growth study. Perch which had been subjected to long-term exposure to 5 micrograms/liter of methoxychlor had an abnormally high oxygen demand when held in a respirometer with a water velocity of 0.6 foot per second.