From The Durango Herald (Dale Rodebaugh):
Rotenone, derived from the root of a tropical plant, is registered by the Environmental Protection Agency as a pesticide. It degrades quickly, leaves no residue and is no threat to humans or other wildlife.
“We did the first treatment last summer,” Joe Lewandowski, a parks and wildlife spokesman, said Thursday. “Then in June they went back to electroshock, which found fish that can live in little water.”
The Rotenone applied this week will catch all survivors, Lewandowski said.
In late summer or in the fall, native Colorado River cutthroat will be stocked in that section of the stream, Lewandowski said.