ISEMP conducts a mark-recapture program that estimate hatchery fraction, sex ratio, and enable estimates of stray rates into • a known, representative fraction of natural-origin age structure non-target populations that are adult steelhead and spring/summer Chinook salmon Develop population specific (wild and monitored by PIT-tag arrays. • as they pass Lower Granite Dam that are hatchery) harvest and incidental mortality subsequently detected in upstream tributaries at estimates in the mainstem Columbia instream PIT-tag arrays. Researchers finding that the commercial, and tribal fisheries. decomposition of the Lower Granite Dam runs-at-large of steelhead and spring/summer Chinook salmon into tributary, population, and MPG- specific escapement estimates is a reliable, precise, and efficient alternative to continuous operation of multiple weirs. Panther Creek Population ICTRT classified this population as extirpated. IDFG index redd surveys not Need more accurate and precise adult SBT propose to install a weir in • • • • However, Chinook salmon spawning has been done every year. abundance data (increased redd Panther Creek to enumerate documented in this drainage in recent years. Accuracy of GSI to identify this surveys, weirs, GSI). Chinook escapement. • IDFG does index redd counts in Panther Creek. population needs to be determined • Adult abundance Data available since 1957. SBT also conducts redd surveys. Natural-origin Snake River Chinook abundance • estimated at LGR by IDFG using GSI beginning 2008. Age composition and sex ratios also determined. Little data available. Need more accurate and precise adult Data be collected from adults • • • Some sampling of carcasses is done during ground productivity estimates. at proposed SBT weir. • redd counts. Adult productivity No hatchery fish are stocked within population. • Recreational fishing for Chinook salmon not • permitted within population boundaries (except in 2001 and 2005 when excess hatchery adults from
• ISEMP conducts a mark-recapture program that a known, representative fraction of natural-origin adult steelhead and spring/summer Chinook salmon as they pass Lower Granite Dam that are subsequently detected in upstream tributaries at instream PIT-tag arrays. Researchers finding that the decomposition of the Lower Granite Dam runs-at-large of steelhead and spring/summer Chinook salmon into tributary, population, and MPG- specific escapement estimates is a reliable, precise, and efficient alternative to continuous operation of multiple weirs. estimate hatchery fraction, sex ratio, and age structure • Develop population specific (wild and hatchery) harvest and incidental mortality estimates in the mainstem Columbia commercial, and tribal fisheries. enable estimates of stray rates into non-target populations that are monitored by PIT-tag arrays. Panther Creek Population Adult abundance • ICTRT classified this population as extirpated. However, Chinook salmon spawning has been documented in this drainage in recent years. • IDFG does index redd counts in Panther Creek. Data available since 1957. SBT also conducts redd surveys. • Natural-origin Snake River Chinook abundance estimated at LGR by IDFG using GSI beginning 2008. Age composition and sex ratios also determined. • IDFG index redd surveys not done every year. • Accuracy of GSI to identify this population needs to be determined • Need more accurate and precise adult abundance data (increased redd surveys, weirs, GSI). • SBT propose to install a weir in Panther Creek to enumerate Chinook escapement. Adult productivity • Little data available. • Some sampling of carcasses is done during ground redd counts. • No hatchery fish are stocked within population. • Recreational fishing for Chinook salmon not permitted within population boundaries (except in 2001 and 2005 when excess hatchery adults from • Need more accurate and precise adult productivity estimates. • Data be collected from adults at proposed SBT weir.
chapters_7-9_idaho_mu_plan_november_2015.docx