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<br />Table 3. Acute toxicities of chlorpyrifos to selected species of aquatic <br />invertebrates and fishes. Values are in ug chlorpyrifos per liter of medium <br />fatal to 50 percent in 96 hours. <br /> <br />Organism, and other variables <br /> <br />LC-50, <br />in ug/l <br /> <br />a <br />Reference <br /> <br />INVERTEBRATES <br /> <br />Mysid, Mvsidoosis bahia <br />Dragonfly (naiad), PseudaQrion spp. <br />Amphipod, Gammarus lacustris <br />Stonefly, pteronarcella badia <br />Stonefly, Claassenia sabulosa <br />Cladoceran, Daohnia maQna <br />Grass shrimp, Palaemonetes QY9iQ <br />Crayfish, Orconectes immunis <br /> <br />Snail, lanistes carinatus <br /> <br />0.035 1 <br />o .10b 2 <br />0.11 3 <br />0.38 4 <br />0.57 4 <br />l.Oc 5 <br />l.5d 5 <br />6.0 6 <br />6.0b 2 <br />10.0 4 <br />4l. Oe 7 <br />>2,000f 8 <br />2,710b 2 <br /> <br />Dragonfly (naiad), Crocothemis <br />ervthrvaea <br /> <br />Stonefly (larva), pteronarcvs <br />californica <br /> <br />Red crayfish, Procambarus <br />clarki <br /> <br />Ram's horn snail, Helisoma <br />trivolvis <br /> <br />FISH <br /> <br />Fathead minnow, Pimeohales promelas <br />Striped bass, Morone saxatilis <br /> <br />0.13 <br />0.58 <br /> <br />9 <br />10 <br /> <br />7 <br />