Fintrol-5 was experimentally tested in six isolated gold dredge ponds in Sumpter Valley. The tests revealed all coarse fish in treated ponds were killed in a period varying between 7 hours and 144 hours; toxic water subbing from treated ponds would kill fish in downstream ponds if water table dillution was not too great; and, the period of toxicity varied from 2 days to 12 days in treated ponds, dependent upon rate of water exchange. One pond without water exchange was treated at a concentration of .075 ppb. All but 30 fish were killed.
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