The Experimental Use of Guthion® as a Selective Fish Eradicator

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Abstract
Channel catfish fingerlings exhibited a greater tolerance of Guthion® than four other species of fish in laboratory tests. Under field conditions, 13 other species of fish were effectively removed by 1.0 ppm of Guthion without significant effects on catfishes. Differences in water quality and temperature did not affect the effectiveness of the chemical. Food organisms were not permanently affected. Insect naiads were evident 10 days after treatments were applied. No difference in the abundance of zooplankters could be attributed to the application of the Guthion. Fish killed by Guthion were not fit for consumption. Profound differences were noted between the residue levels in the flesh as compared to those in the offal of dressed fish. Offal contained up to 2.5 times as much residue as the flesh. Residue levels dropped sharply by the end of 1 week and were no longer detectable 6 weeks after exposure.

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