Never heard of rotenone just part of a lake. Was this a deliberate strategy to feed some of the fish to others?
Up here they will use a low dose of Rotenone to kill Gizzard Shad, they are more susceptible to the Rotenone than the other native fish in the lakes. It won't kill all the shad, but a big portion of them. One local lake had 60% of it's fish biomass in Gizzard Shad.
