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14 96-h LC50 96-h LC50 Test Stage or Temp 95% CI Test Stage or Temp 95% CI organism wt (g) (C) (µg/L) organism wt (g) (C) (mg/L) Largemouth bass 0.9 18 4.8 3.1-7.4 Fathead minnow' 0.9 18 >50 Black crappie 1.0 18 3.0 Bluegill' 1.0 18 12.1 2.3-3.8 7.2-10.1 Yellow perch 1.4 18 15 Rainbow trout' 0.5 13 5.2 11-19 aTested in hard water, 272 ppm CaCO,. Channel catfish' 1.4 18 4.93 2.58-9.43 NOTE: Variations in test temperatures from 2 ° to 18 °C for rainbow trout and 120 to 220C for bluegills produced no change in toxicity at the lower tempera- tures and a twofold increase at the highest tem- perature. Yellow perch became substantially more sus- Chemical Name: 2',5-Dichloro-4'-nitrosalicylamide, 2- ceptible with an increase in temperature; 96-h LC50's aminoethanolsalt decreased from 40 to 2.4 µg/L when temperature was increased from 7 ° to 22 °C. Variations in water hard- Alternate Names: Bay 73, Bay 25648, Bayer 73, CAS ness from 12 to 300 ppm produced no change in tox- 1420-04.8, Clonitralid icity to scuds or fish. Alkaline solutions (pH 8.5 to 9.0) were slightly less toxic to fish than more acidic solu- Principal Use: Molluscicide tions (pH 6.5 to 7.5). One to 3 weeks of aqueous degra- dation produced a 1.3- to 2-fold increase in 96-h LC50's Sample Description: Wettable powder, 70% for Atlantic salmon and yellow perch. Atlantic salmon eggs were highly tolerant to poisoning (11-day LC50 SUMMARY OF ACUTE TOXICITY greater than 50 mg/L). Susceptibility of yolk-sac fry 96-h LC50 equaled that of fingerlings. Time-independent LC50's Test Stage or Temp 95% CI were 0.23, 0.29, and 0.32 µg/L for Atlantic salmon, organism wt (g) (C) (µg/L) bluegill, and yellow perch, respectively. Cumulative toxicity indices varied from 10.9 to 20.5, indicating a Daphnia magna I1 21 190ab moderate to high degree of cumulative action (for an 140-270 organophosphate). G. pseudolimnaeus M 21 2,400b AZODRIN Chemical Name: Dimethyl phosphate of 3-hydroxy-N- methyl-cis-crotonamide Orconectes P¢laemonetes IE 21 M 21 YC2 15 Alternate Names: CAS-141-66-2, Ciba 1414, ENT- 27129, Monocron, Monocrotophos, Nuracron, SD Pteron¢rcys 9129 Principal Use: Insecticide Chironomus Sample Description: Technical material, 100%1; dis- persible liquid, 3.2 lb/gal' Rainbow trout SUMMARY OF ACUTE TOXICITY a48-h EC50. 96-h LC50 bTested in hard water, 272 ppm CaCO,. Test Stage or Temp 95% CI NOTE: Whole body residues were low in invertebrates organism wt (g) (C) (mg/1) exposed to C"-Bayluscide (1 gg/L). Within 48 h, inver- G. fasciatus' M 15 0.3 tebrates (daphnids, sowbugs, scuds, glass shrimp, I4 21 1.4 13 1,800-3,100 25,000b 19,000-33,000 10,000b 7,000-15,000 200 130-300 1,600ab 1,100-2,200 340 289-399