Natural-origin Snake River Steelhead MPG and No CV estimates made. • • population abundance via GSI at Lower Granite Dam began in 2008. IDFG providing increased monitoring of B-run • steelhead (Columbia Basin Fish Accords). IDFG Accord provides $150,000/yr to do GSI Population is not heavily Need adult abundance and age • • • assessments (combined with age and sex comp.) in influenced by hatchery steelhead; structure data for index subpopulation. Clearwater and Salmon River. hatchery fraction data are lacking. Develop surveys of hatchery spawner • Annual parr density monitoring (surrogate for adults) Estimates of natural population fraction in index streams. • • conducted by IDFG within population. incidental mortality from Reevaluate juvenile sampling design • Sport fishing for adult steelhead is not permitted recreational fisheries are and verify age structure assumptions • within population boundaries. imprecise. needed for productivity estimates. productivity Estimating adult steelhead Develop habitat and life cycle model(s) • • abundance cannot be done to synthesize available data to accurately at the population scale extrapolate from other populations. using current methods in high and turbid flows, juvenile estimates are important as a proxy for adult productivity. NPT operates screw trap in Meadow Creek. Imprecision of SARs at Increased PIT tagging or roll up SARs Explore feasibility of sampling • • • • Steelhead not PIT-tagged. population level. to larger scale. smolts at LGD for GSI and age In 2007 IDFG adopted a rotating panel probabilistic Dispersed PIT conducted PIT-tag juvenile steelhead at Meadow composition • • • Juvenile GRTS design for assessing juvenile abundance. in 1995-2006. Creek screw trap. productivity Upper Selway done in 2008 other portions are No CV estimates made. Explore alternative method of • • planned for sampling as well. estimating SARs with precision. IDFG providing increased monitoring of B-run • steelhead (Columbia Basin Fish Accords).
• Natural-origin Snake River Steelhead MPG and population abundance via GSI at Lower Granite Dam began in 2008. • IDFG providing increased monitoring of B-run steelhead (Columbia Basin Fish Accords). • No CV estimates made. productivity • IDFG Accord provides $150,000/yr to do GSI assessments (combined with age and sex comp.) in Clearwater and Salmon River. • Annual parr density monitoring (surrogate for adults) conducted by IDFG within population. • Sport fishing for adult steelhead is not permitted within population boundaries. • Population is not 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 at the population scale using current methods in high and turbid flows, juvenile estimates are important as a proxy for adult productivity. • Need adult abundance and age structure data for index subpopulation. • Develop surveys of hatchery spawner fraction in index streams. • 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 other populations. Juvenile productivity • NPT operates screw trap in Meadow Creek. Steelhead not PIT-tagged. • In 2007 IDFG adopted a rotating panel probabilistic GRTS design for assessing juvenile abundance. Upper Selway done in 2008 other portions are planned for sampling as well. • IDFG providing increased monitoring of B-run steelhead (Columbia Basin Fish Accords). • Imprecision of SARs at population level. • Dispersed PIT conducted in 1995-2006. • No CV estimates made. • Increased PIT tagging or roll up SARs to larger scale. • PIT-tag juvenile steelhead at Meadow Creek screw trap. • Explore alternative method of estimating SARs with precision. • Explore feasibility of sampling smolts at LGD for GSI and age composition
chapters_7-9_idaho_mu_plan_november_2015.docx