PIT tag array in Big Creek at Taylor Ranch. • IDFG Columbia Basin Fish Accord provides Need better estimates of natural Develop surveys of hatchery spawner • • • $150,000/yr to do GSI assessments (combined with cohort age and sex structure. fraction in index streams (Big Creek). age and sex comp.) in Clearwater and Salmon Rivers. Estimates of natural population Reevaluate juvenile sampling design • • ISMES (BPA 199005500 ). Intensive steelhead incidental mortality from sport and verify age structure assumptions • monitoring in Big Creek under ISMES. Abundance fisheries are imprecise. needed for productivity estimates. and life history data collected in Big Creek. Estimating adult steelhead Develop habitat and life cycle model(s) • • No sport fishing for adult steelhead permitted within abundance cannot be done to synthesize available data to • the boundaries of this population. accurately using traditional extrapolate from index samples to an Annual parr density monitoring (surrogate for adults) methods in high and turbid flows; appropriate population scale. • conducted by IDFG within population. juvenile estimates are important as Collect enough adults to get • INPMEP (BPA 199107300) a proxy for adult productivity. quantitative information. • Some adults sampled by angling in Big Creek. Population may be influenced by SBT and NPT will need to document • • • One trap operated by IDFG on lower Big Creek. hatchery steelhead; hatchery harvest impacts in future tribal fisheries if • productivity Juvenile abundance estimated at screw trap using fraction data are lacking. implemented. • mark recapture. Current adult sampling not Modify PIT antenna in lower Big • • Survival of juveniles to LGR estimated using PIT quantitative. Creek for year-round dependability. • tags. PHOS not estimated. Increase PIT tagging or roll up SARs to • • Age structure estimated from scale analysis. Short time frame for screw trap larger • • PIT antenna array at Taylor Ranch. data (starting 2007) CV not known Explore alternative methods of • • or not calculated? estimating SARs. PIT antenna array in Big Creek • operated entire (attempted). –year Dispersed PIT tagging 2000-06. • Determine representativeness of • Big Creek to entire population. Imprecision of SARs at • population level.
• PIT tag array in Big Creek at Taylor Ranch. productivity • IDFG Columbia Basin Fish Accord provides $150,000/yr to do GSI assessments (combined with age and sex comp.) in Clearwater and Salmon Rivers. • ISMES (BPA 199005500 ). Intensive steelhead monitoring in Big Creek under ISMES. Abundance and life history data collected in Big Creek. • No sport fishing for adult steelhead permitted within the boundaries of this population. • Annual parr density monitoring (surrogate for adults) conducted by IDFG within population. • INPMEP (BPA 199107300) • Some adults sampled by angling in Big Creek. • One trap operated by IDFG on lower Big Creek. • Juvenile abundance estimated at screw trap using mark recapture. • Survival of juveniles to LGR estimated using PIT tags. • Age structure estimated from scale analysis. • PIT antenna array at Taylor Ranch. • Need better estimates of natural cohort age and sex structure. • Estimates of natural population incidental mortality from sport fisheries are imprecise. • Estimating adult steelhead abundance cannot be done accurately using traditional methods in high and turbid flows; juvenile estimates are important as a proxy for adult productivity. • Population may be influenced by hatchery steelhead; hatchery fraction data are lacking. • Current adult sampling not quantitative. • PHOS not estimated. • Short time frame for screw trap data (starting 2007) CV not known or not calculated? • PIT antenna array in Big Creek operated entire –year (attempted). • Dispersed PIT tagging 2000-06. • Determine representativeness of Big Creek to entire population. • Imprecision of SARs at population level. • Develop surveys of hatchery spawner fraction in index streams (Big Creek). • Reevaluate juvenile sampling design and verify age structure assumptions needed for productivity estimates. • Develop habitat and life cycle model(s) to synthesize available data to extrapolate from index samples to an appropriate population scale. • Collect enough adults to get quantitative information. • SBT and NPT will need to document harvest impacts in future tribal fisheries if implemented. • Modify PIT antenna in lower Big Creek for year-round dependability. • Increase PIT tagging or roll up SARs to larger • Explore alternative methods of estimating SARs.
chapters_7-9_idaho_mu_plan_november_2015.docx