Natural-origin Snake River Chinook abundance • estimated at LGR by IDFG using GSI beginning 2008. Age composition and sex ratios also determined. IDFG and NOAA operated an captive rearing • program for Chinook in the EF Salmon River. The program has ended, with the last adults stocked in 2010. Sex ratio, hatchery proportion, length, percent Need more accurate and precise adult • • spawned, DNA, age structure are obtained from productivity estimates. carcasses surveyed during SBT ground redd count surveys and from adults trapped at EF Salmon weir. No hatchery fish are stocked within population • boundaries except captive adults (up until 2010). productivity Hatchery smolts were released from 1993 1995 for – ISS study. No recreational fishing for Chinook salmon allowed • within population boundaries. SBT monitors and estimates tribal harvest (hatchery • and wild). SBT operates a screw trap in the EF Salmon River Sample size from NMFS Increase PIT sample size. • • • downstream of the weir. tagging may be too small to obtain Juvenile abundance estimated at screw trap using accurate and precise estimates • mark recapture. Juvenile NMFS PIT-tags juvenile Chinook salmon during the • productivity summer (not done in 2008). SBT and NMFS PIT-tag data used to determine • and survival at LGR. SBT-SRHE snorkel Herd Creek yearly, since 1990s •
• Natural-origin Snake River Chinook abundance estimated at LGR by IDFG using GSI beginning 2008. Age composition and sex ratios also determined. • IDFG and NOAA operated an captive rearing program for Chinook in the EF Salmon River. The program has ended, with the last adults stocked in 2010. productivity • Sex ratio, hatchery proportion, length, percent spawned, DNA, age structure are obtained from carcasses surveyed during SBT ground redd count surveys and from adults trapped at EF Salmon weir. • No hatchery fish are stocked within population boundaries except captive adults (up until 2010). Hatchery smolts were released from 1993 – 1995 for ISS study. • No recreational fishing for Chinook salmon allowed within population boundaries. • SBT monitors and estimates tribal harvest (hatchery and wild). • Need more accurate and precise adult productivity estimates. Juvenile productivity • SBT operates a screw trap in the EF Salmon River downstream of the weir. • Juvenile abundance estimated at screw trap using mark recapture. • NMFS PIT-tags juvenile Chinook salmon during the summer (not done in 2008). • SBT and NMFS PIT-tag data used to determine and survival at LGR. • SBT-SRHE snorkel Herd Creek yearly, since 1990s • Sample size from NMFS may be too small to obtain accurate and precise estimates • Increase PIT sample size. tagging