Colorado Parks and Wildlife is draining the Rito Hondo Reservoir and is applying a piscicide to kill off existing fish before the agency reintroduces native Rio Grande cutthroat trout.
Removal of other fish is necessary because non-native trout compete, prey on and sometimes hybridize with Rio Grande cutthroat trout, according to the CPW.
The CPW says rotenone is a"registered piscicide" with the U.S. Environmental Protection Agency, it and has historically"been used by indigenous peoples to capture fish." The chemical has been"successfully used" by the CPW and other state fish and game agencies for more than 80 years, according to the CPW’s news release.and invertebrates when used properly," according to the CPW.
The Colorado Parks and Wildlife is restoring the Rito Hondo Reservoir with Rio Grande cutthroat broodstock.Rio Grand cutthroat trout are one of three native trout species indigenous to Colorado.
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