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TOXICITY OF DIAZINON TO BROOK TROUT AND FATHEAD MINNOWS
Citation:
Allison, D. AND R. Hermanutz. TOXICITY OF DIAZINON TO BROOK TROUT AND FATHEAD MINNOWS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-77/060 (NTIS PB269293).
Description:
Fathead minnows exposed to diazinon from 5 days through 24 weeks post hatch developed severe scoliosis. The incidence and degree of spinal deformity correlated to exposure level. Fish in 3.2 micrograms/l was 30% lower than the controls. Hatch of eggs from fathead minnows exposed to 3.2 micrograms/l was 30% lower than the controls. Yearling brook trout exposed to 4.8 micrograms and above developed scoliosis and lordosis within a few weeks. Acute toxicity tests with diazinon yielded 96-hr LC50's of 7.8, 1.6, 0.77 and 0.46 micrograms respectively for fathead minnows, flagfish, brook trout and bluegills.