bhb1034 - You can use the rotemnone when water temps are 67F with good results regarding temp. Complete kills can occur when water temps range from 45F-75F. Most favorable temp for treating is 61F. High turbidity of water to be treated requires higher concentrations of rotenone. Rotenone will tend to bind with clay turbidity or heavy algae blooms. It is best to treat on an overcast day. Sunlight speeds detoxification of rotenone. If it was me I would to a kill test in a tub or similar container by using your estimated concentration on one or two catfish before treating the whole pond to make sure the turbidity levels are not too high to produce a complete kill.
