The National Park Service is contemplating some rather drastic steps to remove "Non-native Aquatic Species" of fish, including Brown Trout, from the Colorado River, particularly the Lees Ferry stretch below Glen Canyon Dam.
The mechanical removal of these fish would primarily be done by electroshocking. It is well know to AZGFD fisheries biologists that such drastic actions will have serious deleterious effects on the Rainbow Trout in this reach of river, the species which has made it famous the world over as a fly fishing mecca and which has continued to sustain a thriving economy in the area.
I would urge this concerned for the future of the Lees Ferry fishery to contact (by Jan 5, 2018, their deadline for accepting input) the NPS and submit comments in opposition to this misguided plan. Simply google NPS Lees Ferry comments to get to the simple form.