The Use of Periodic Light Applications of Rotenone as a Management Technique for Small Impoundments

摘要

A light (.1 ppm) application of rotenone was administered to two experimental ponds on June 26, 1979 in an effort to reduce larval bluegill survival through direct toxicity and by reduction of the food base (zooplankton) leading to starvation of the larvae. An average of .1 ppm concentration of rotenone caused noticeable increases in larval bluegill mortality without observed mortality or stress in bass or larger bluegill. A dosage of .07 ppm rotenone was observed to have minimal influence on larval bluegill numbers. An accurate, properly timed, light application of rotenone has potential as a useful and inexpensive (about $3) technique to manage ponds with excessive prey (bluegill) production.