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4444 <br />T <br />U <br />U <br />.b' <br />0 <br />0 <br />x <br />C <br />6 <br />r <br /> <br /> <br />Q. Is rotenone likely to enter ground water and pollute <br />water supplies? <br />A. The mobility of rotenone in soil is low to slight. The <br />expected leaching distance of rotenone in soils would <br />be only 2 cm (less than one inch) in most types of <br />soils. An exception would be in sandy soils where the <br />expected leaching distance is about 8 cm (sightly <br />more than 3 inches). Rotenone is strongly bound to <br />organic matter in soil so it is unlikely that rotenone <br />would enter ground water, even if it had not <br />degraded. <br />Because of its rapid breakdown, rotenone leaves <br />only temporary residues that would not persist as <br />pollutants of ground water supplies. <br />Q. Why use a chemical fish control agent? <br />A. Fishery resource managers have tried many ways to <br />manipulate fish populations. Although some <br />approaches are useful in special circumstances, most <br />are only partially effective. Others take several years <br />before the outcome is evident, and some apply only <br />to one or two species. <br />Use of a fish toxicant enables managers to establish <br />a definite population at a specific time and makes it <br />possible to clearly follow growth and abundance of <br />the re-stocked species.