Abstract
ABSTRACT I field-tested the effectiveness of a rotenone-laced fish food designed for control of common carp, Cyprinus carpio. Using food retention stations in a 3.2-ha artificial impoundment, bait food was used to lure target fish into a regular feeding pattern prior to introduction of poisoned food. When rotenone-laced food was introduced, only one common carp and 23 channel catfish (Ictalurus punctatus) were killed, although later liquid rotenone treatment revealed that hundreds of individuals of these species inhabited the impoundment. I observed fish taking and then rejecting rotenone-laced food and thus conclude both common carp and channel catfish could taste differences between bait and poisoned food. Fish appeared to develop an aversion to rotenone-laced food by the second trial. My results indicate that the current formulation of this product will not be an effective means for controlling common carp unless the issue of palatability is resolved.
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