Abstract:

Bioassay trials conducted in triplicate determined 24-hour and 48-hour LC₁₀₀ values to the snakehead, Channa pucntata, of Sumithion (fenitrothion), DDVP, Phyphanon (malathion), dieldrin and Phostoxin (phosphine). Two recommended piscicides, bleaching powder and rotenone, were also evaluated for cost comparisons. The 24-hour LC₁₀₀ values ranged from 15 ppm of bleaching powder to 0.25 ppm of Phostoxin. Detoxification of Phostoxin, as determined by survival of carp fry, occurred in 4 days in laboratory tanks at 23ºC and in 1 day in earthen ponds at 30ºC. Rotenone required 6 days at 2.5 ppm and bleaching powder 17 days at 15 ppm to detoxify in laboratory tests at 23ºC. Indian-produced phosphine was of least cost for fish eradiation, followed by dieldrin, Phostoxin, and bleaching powder.

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Date 1989/06/01

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