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44 96-h LC50 perature was incrementally increased from 7° to 29°C. Test Stage or Temp 95% CI No change in toxicity to rainbow trout was noted at organism wt (g) (C) (µg/L) water hardnesses between 44 and 272 ppm. Significant -- toxic effects were noted in the two high treatment levels in ponds treated with 12.5, 25, 37.5, and 50 µg/L Daphnia pulex' 11 15 428 of heptachlor. Mortalities for bluegills and aquatic 21-63 invertebrates were 90 and 100%, respectively, within 7 days after treatment. However, invertebrates showed G. fasciatus' M 15 56 nearly complete recovery within 28 days. Bluegills 33.78 accumulated peak whole body residues ranging from 11 to 57 ppm within 2 weeks after treatment; residues G. lacustris' M 2] 29 were reduced about 50% after 28 days and were unde- tectable after 84 days. Severe degenerative liver Palaemonetes' M 21 1.8 lesions that developed within 14 days after treatment 1.4-2.4 were maintained through 56 days post-treatment. A gradual return to normal occurred thereafter. No dif- Orconectes' IE 21 0.5 ferences in growth or spawning success were noted be- 0.3-1.8 tween treated and untreated ponds. Bluegills fed diets containing 5 to 25 ppm heptachlor showed toxic re- Pteronarcvs' YC2 15 1.1 sponses similar to those of fish in treated ponds. 0.9-1.4 Pteronarcella' N 15 0.9 0.6-1.3 HEXACHLOROBENZENE Claassenia' YC2 15 2.8 Chemical Name: Hexachlorobenzene 2.1-3.7 Alternate Names: Anticarie, Bunt Cure, Bunt-No- Rainbow trout' 0.8 13 7.4 More, CAS-118-74-1, ENT-1719, HCB, Hexa C.B., 6.7-8.2 No Bunt, Sanocide, Smut-Go. Northern pike' 0.7 18 6.2 Principal Use: Fungicide, Industrial intermediate Fathead minnow' 1.3 18 23 Sample Description: Technical material, 80-96% Black bullhead' 0.9 24 63 46.86 SUMMARY OF ACUTE TOXICITY Channel catfish' 1.0 18 25 96-h LC50 17-36 Test Wt Temp 95% CI organism (g) (C) (mg/L) Bluegill' 1.0 17 13 9-19 Coho salmon 0.5 7 > 50 Redear sunfish' 1.1 24 17 Fathead minnow 0.7 20 22 15.19 Channel catfish 0.8 20 14 Largemouth bass' 0.8 18 10 11-16 7.4.14 Bluegill 1.0 20 12a Rainbow trout' 1.2 13 20 16-25 Largemouth bass 0.5 21 124 aTested in hard water. Bluegill' 0.5 24 5.3 3.9.7.2 olk-sac NOTE: In channel catfish the 96-h LC50 for y a48-h EC50. fry was about half the value for fingerlings. Rainbow trout accumulated residues 3,800 to 8,900 times the NOTE: Test temperatures ranging from 2° to 18°C did exposure level of 0.1 to 2.0 µg/L within 28 days, and not alter the toxici ty to rainbow trout; however, a 4.8- Daphnia accumulated residues near 900 times the fold increase was noted in redear sunfish when tem- exposure level of 0.05 to 0.15 µg/L within 48 h. The