Since 2000 ISMES has collected and processed Develop habitat and life history • • DNA samples throughout the Clearwater and Salmon model(s) to synthesize available data to basins. In 2007, 678 DNA samples were analyzed. extrapolate from index samples to an appropriate population scale. Pahsimeroi River Population One weir at IDFG Pahsimeroi Hatchery; collects Weir is believed to be 100% but • • adult spawner abundance, sex ratio, lengths. needs to be evaluated. Integrate wild steelhead monitoring at • Hatchery fish released at Pahsimeroi Hatchery and Kelts not collected to estimate Pahsimeroi hatchery weir more • • in mainstem Salmon River for harvest augmentation weir efficiency. thoroughly with monitoring within the boundaries of this population. Accuracy of GSI to identify this program. • abundance Natural-origin Snake River Steelhead MPG and population not yet determined. • population abundance via Genetic Stock Identification Cow Creek Ave. CV = 10.8 with • at LGR began in 2008. Age and length composition a range of 3.9 to 20.5. and sex ratios also determined. SBT conduct tribal harvest monitoring. • Age structure information, sex ratios, hatchery Estimates of natural population Develop surveys of hatchery spawner • • • percentage estimated at weir. incidental mortality from sport fraction in index streams below weir. PIT-tags scanned at weir. fisheries are imprecise. Reevaluate juvenile sampling design • • IDFG Accord provides $150,000/yr to do GSI Estimating steelhead and verify age structure assumptions • • assessments (combined with age and sex comp.) in abundance below weir cannot be needed for productivity estimates. Clearwater and Salmon River. done accurately using traditional Develop habitat and life cycle model(s) • Adult productivity ISMES methods in high and turbid flows, to synthesize available data to • IDFG phone survey estimates sport harvest in juvenile estimates are important as extrapolate from index samples to an • recreational fisheries. a proxy for adult productivity. appropriate population scale. Sport fishing for adult steelhead within population Population downstream of the • • boundaries is permitted only in the mainstem Salmon weir influenced by hatchery River. steelhead; hatchery fraction data INPMEP are lacking. •
• Since 2000 ISMES has collected and processed DNA samples throughout the Clearwater and Salmon basins. In 2007, 678 DNA samples were analyzed. • Develop habitat and life history model(s) to synthesize available data to extrapolate from index samples to an appropriate population scale. Pahsimeroi River Population abundance • One weir at IDFG Pahsimeroi Hatchery; collects adult spawner abundance, sex ratio, lengths. • Hatchery fish released at Pahsimeroi Hatchery and in mainstem Salmon River for harvest augmentation within the boundaries of this population. • Natural-origin Snake River Steelhead MPG and population abundance via Genetic Stock Identification at LGR began in 2008. Age and length composition and sex ratios also determined. • SBT conduct tribal harvest monitoring. • Weir is believed to be 100% but needs to be evaluated. • Kelts not collected to estimate weir efficiency. • Accuracy of GSI to identify this population not yet determined. • Cow Creek Ave. CV = 10.8 with a range of 3.9 to 20.5. • Integrate wild steelhead monitoring at Pahsimeroi hatchery weir more thoroughly with monitoring program. Adult productivity • Age structure information, sex ratios, hatchery percentage estimated at weir. • PIT-tags scanned at weir. • IDFG Accord provides $150,000/yr to do GSI assessments (combined with age and sex comp.) in Clearwater and Salmon River. • ISMES • IDFG phone survey estimates sport harvest in recreational fisheries. • Sport fishing for adult steelhead within population boundaries is permitted only in the mainstem Salmon River. • INPMEP • Estimates of natural population incidental mortality from sport fisheries are imprecise. • Estimating steelhead abundance below weir cannot be done accurately using traditional methods in high and turbid flows, juvenile estimates are important as a proxy for adult productivity. • Population downstream of the weir influenced by hatchery steelhead; hatchery fraction data are lacking. • Develop surveys of hatchery spawner fraction in index streams below weir. • 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.
chapters_7-9_idaho_mu_plan_november_2015.docx