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Effective management of sport fisheries at the Nechako River can be affected by flow regimes that result from regulated water releases at the Nechako Reservoir. The effects of four potential flow regimes on trout and char habitat and standing crop in the upper Nechako River were examined. Three methodologies were applied including the instream flow incremental method (IFIM), the fixed percentage or Montana method, and the habitat quality index (HQI). A flow regime at Cheslatta Falls of >70 m3/sec (spring-summer), 38 m3/sec (fall-winter) and 170 m3/sec (peaking flow) was necessary to enable rainbow trout and char populations to approach habitat capacity. However, these "state of the art" methods are subject to uncertainty and a significant risk of error; therefore, a conservative flow regime for fish habitat protection is recommended. Preliminary enumeration and sampling of trout and char populations in the upper Nechako River indicated a depressed status coinciding with a depressed fishery. The fishery upstre
Slaney, P.A., Rosenau, M.L.; Ableson, D.H.G.; Morley, R.L.. 1984. Habitat Capability of the Nechako River for Rainbow Trout and Char and the Effects of Various Flow Regimes. Ministry of Environment. Fisheries Technical Circular. FTC63
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