Species diversity Age and diversity data for 1999, 2001-2012 available Genetic analysis of adults and/or Implement a 5-year rotating panel • • • from INPMEP. juveniles from this population need to be to collect baseline genetic included in baseline genetic database. samples. Genetic baseline to be maintained • at regular intervals Big Creek Population abundance IDFG index redd sites in Big Creek. Data available Accuracy of GSI to identify this Need more accurate and precise adult • • • since 1957. population to be determined abundance data (increased redd NMFS operates a PIT-tag in Big Creek at Taylor PIT-tag sample size too small to surveys, weirs, GSI). • • Ranch. make accurate adult escapement Natural-origin Snake River Chinook abundance estimates at current level of • estimated at LGR by IDFG using Genetic Stock tagging effort. Identification beginning 2008. Age composition and sex ratios also determined. Adult productivity Little or no data. Carcass surveys lacking for most Need more accurate and precise adult ground spawning surveys to • • • • Hatchery fish are not released within population of this population. age structure data augment aerial index counts and to • boundaries. Additional sampling of SBT collect life history data. • No recreational fishing for Chinook salmon allowed anglers to improve estimates of • within population boundaries. tribal harvest SBT conducts tribal fisheries in Big Creek. • Juvenile IDFG operates a screw trap in Big Creek at Taylor Short time series for screw trap • • productivity Ranch (rkm 11). (since 2007). Juvenile abundance estimated at screw trap using • mark recapture. NMFS PIT-tags juvenile Chinook salmon during the • summer throughout Big Creek drainage. PIT-tag data from NMFS and IDFG screw trap used • to determine run-timing and survival at LGR.
Species diversity • Age and diversity data for 1999, 2001-2012 available from INPMEP. • Genetic analysis of adults and/or juveniles from this population need to be included in baseline genetic database. • Genetic baseline to be maintained at regular intervals • Implement a 5-year rotating panel to collect baseline genetic samples. Big Creek Population abundance • IDFG index redd sites in Big Creek. Data available since 1957. • NMFS operates a PIT-tag in Big Creek at Taylor Ranch. • Natural-origin Snake River Chinook abundance estimated at LGR by IDFG using Genetic Stock Identification beginning 2008. Age composition and sex ratios also determined. • Accuracy of GSI to identify this population to be determined • PIT-tag sample size too small to make accurate adult escapement estimates at current level of tagging effort. • Need more accurate and precise adult abundance data (increased redd surveys, weirs, GSI). Adult productivity • Little or no data. • Hatchery fish are not released within population boundaries. • No recreational fishing for Chinook salmon allowed within population boundaries. • SBT conducts tribal fisheries in Big Creek. • Carcass surveys lacking for most of this population. • Additional sampling of SBT anglers to improve estimates of tribal harvest • Need more accurate and precise adult age structure data • ground spawning surveys to augment aerial index counts and to collect life history data. Juvenile productivity • IDFG operates a screw trap in Big Creek at Taylor Ranch (rkm 11). • Juvenile abundance estimated at screw trap using mark recapture. • NMFS PIT-tags juvenile Chinook salmon during the summer throughout Big Creek drainage. • PIT-tag data from NMFS and IDFG screw trap used to determine run-timing and survival at LGR. • Short time series for screw trap (since 2007).