All three MSA’s have redd count surveys. There are • Spatial distribution no MSA’s. Adult data obtained from carcasses sampled during Genetic baseline to be maintained Implement a 5-year rotating panel • • • redd counts. at regular intervals for baseline genetic samples. Species diversity Age and diversity data available 1998 from SBT propose to collect DNA from • • INPMEP. juveniles collected at the rotary screw trap and adults. Marsh Creek Population IDFG does index redd counts throughout the Marsh Accuracy of GSI to identify this Need more accurate and precise adult SBT propose a DIDSON weir in • • • • Creek drainage. Data available since 1957. population needs to be determined abundance data (increased redd Marsh Creek to evaluate adult IDFG does multi-pass redd counts in Marsh Creek surveys, weirs, GSI). escapement. • for ISS study. This is a control stream for the ISS Adult abundance study. Natural-origin Snake River Chinook abundance • estimated at LGR by IDFG using GSI beginning 2008. Age composition and sex ratios also determined Sex ratio, hatchery proportion, length, percent Additional sampling of SBT Need more accurate and precise age • • • spawned, DNA, age structure are obtained from anglers to improve estimates of structure data. carcasses sampled during IDFG ground redd count tribal harvest surveys. Hatchery fish are not stocked within population • productivity boundaries. No recreational fishing for Chinook allowed within • population boundaries. SBT conducts tribal fisheries. • SBT monitors and estimates tribal harvest. • Juvenile IDFG has operated a trap in Marsh Creek since • productivity 1992 for ISS.
Spatial distribution • All three MSA’s have redd count surveys. There are no MSA’s. Species diversity • Adult data obtained from carcasses sampled during redd counts. • Age and diversity data available 1998 from INPMEP. • Genetic baseline to be maintained at regular intervals • Implement a 5-year rotating panel for baseline genetic samples. • SBT propose to collect DNA from juveniles collected at the rotary screw trap and adults. Marsh Creek Population Adult abundance • IDFG does index redd counts throughout the Marsh Creek drainage. Data available since 1957. • IDFG does multi-pass redd counts in Marsh Creek for ISS study. This is a control stream for the ISS study. • Natural-origin Snake River Chinook abundance estimated at LGR by IDFG using GSI beginning 2008. Age composition and sex ratios also determined • 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 a DIDSON weir in Marsh Creek to evaluate adult escapement. productivity • Sex ratio, hatchery proportion, length, percent spawned, DNA, age structure are obtained from carcasses sampled during IDFG ground redd count surveys. • Hatchery fish are not stocked within population boundaries. • No recreational fishing for Chinook allowed within population boundaries. • SBT conducts tribal fisheries. • SBT monitors and estimates tribal harvest. • Additional sampling of SBT anglers to improve estimates of tribal harvest • Need more accurate and precise age structure data. Juvenile productivity • IDFG has operated a trap in Marsh Creek since 1992 for ISS.
chapters_7-9_idaho_mu_plan_november_2015.docx