PIT-tags scanned at weirs; however, sample size is Population is heavily influenced Reevaluate juvenile sampling design • • • too small for precise estimates of adult productivity. by hatchery steelhead; hatchery and verify age structure assumptions IDFG phone survey estimates sport harvest in fraction data are lacking. needed for productivity estimates. • recreational fisheries. Estimates of natural population Develop habitat and life model(s) to • • Sport fishing for adult steelhead within population incidental mortality from synthesize available data to extrapolate • boundaries is permitted in mainstem SF Clearwater recreational fisheries are from index samples to an appropriate River only. imprecise. Estimating adult population scale. Annual parr density monitoring (surrogate for adults) steelhead abundance cannot be • conducted by IDFG within population. done accurately using current NPT B-run steelhead supplementation effectiveness methods in high and turbid flows, • monitoring in SF Clearwater. juvenile estimates are important as ISMES (BPA 199005500) $784K/yr a proxy for adult productivity. • ISEMP PIT tag array installed in South Fork • Clearwater mainstem. Juvenile IDFG /NPT operate 3 screw traps, in American, Representativeness of index Increased PIT or roll up SARs • • • •wq productivity Crooked and Red Rivers (all scheduled to cease streams to entire population. to larger scale. operation in 2014). Imprecision of SAR estimates at Explore alternative method of • • NPT operates 1 screw trap in Newsome Creek. population estimating SARs with precision. • Juvenile migrant abundance estimated at screw No CV estimates made. • • traps using PIT Tag mark recapture (ISS 198909800). Survival of juveniles to LGR estimated using PIT • tags. Age structure estimated from scales collected at • traps. In 2007 IDFG adopted a rotating panel probabilistic • GRTS design for assessing the abundance of juvenile salmonids (INPMEP, BPA#1999107300)
• PIT-tags scanned at weirs; however, sample size is too small for precise estimates of adult productivity. • IDFG phone survey estimates sport harvest in recreational fisheries. • Sport fishing for adult steelhead within population boundaries is permitted in mainstem SF Clearwater River only. • Annual parr density monitoring (surrogate for adults) conducted by IDFG within population. • NPT B-run steelhead supplementation effectiveness monitoring in SF Clearwater. • ISMES (BPA 199005500) $784K/yr • ISEMP PIT tag array installed in South Fork Clearwater mainstem. • Population is heavily influenced by hatchery steelhead; hatchery fraction data are lacking. • Estimates of natural population incidental mortality from recreational fisheries are imprecise. Estimating adult steelhead abundance cannot be done accurately using current methods in high and turbid flows, juvenile estimates are important as a proxy for adult productivity. • Reevaluate juvenile sampling design and verify age structure assumptions needed for productivity estimates. • Develop habitat and life model(s) to synthesize available data to extrapolate from index samples to an appropriate population scale. Juvenile productivity • IDFG /NPT operate 3 screw traps, in American, Crooked and Red Rivers (all scheduled to cease operation in 2014). • NPT operates 1 screw trap in Newsome Creek. • Juvenile migrant abundance estimated at screw traps using PIT Tag mark recapture (ISS 198909800). • Survival of juveniles to LGR estimated using PIT tags. • Age structure estimated from scales collected at traps. • In 2007 IDFG adopted a rotating panel probabilistic GRTS design for assessing the abundance of juvenile salmonids (INPMEP, BPA#1999107300) • Representativeness of index streams to entire population. • Imprecision of SAR estimates at population • No CV estimates made. • Increased PIT or roll up SARs to larger scale. • Explore alternative method of estimating SARs with precision. •wq
chapters_7-9_idaho_mu_plan_november_2015.docx