Evaluation of Depletion-Removal Electrofishing of Brook Trout in Small Rocky Mountain Streams

摘要: Abstract We evaluated the effectiveness of three-pass depletion electrofishing for removing introduced brook trout Salvelinus fontinalis from small mountain streams that contained native populations Colorado River cutthroat Oncorhynchus clarki pleuriticus. Estimates based on indicated removal efficiencies 73–100% age-0 and 59–100% older trout. number fish caught 1 year later 42–83% 92–96% fish. The lower reflected difficulty in spotting with overhanging vegetation, undercut banks, large woody debris. Because were not captured as effectively larger trout, a single pass after depletion-removal helped further reduce numbers. Although eradicated any study streams, treatment ...