IDFG has operated a rotary screw trap in SF Salmon Screw trap 95% CI =4.8%-33.9% • • River just upstream of adult weir since 1992 as part of Fish upstream of the trap may • ISS. not be representative of the entire Juvenile migrant abundance estimated at traps population. • using mark recapture. Survival of juveniles to LGR estimated using PIT • tags. Juvenile Smolt yield estimated for adults spawning upstream • productivity of hatchery weir using screw trap data and downriver PIT-tag detections. rotary screw trap in mainstem SF upstream of • EF SF Salmon River. IDFG fixed site snorkel surveys done 1980 2006. • – In 2007 IDFG adopted a rotating panel probabilistic GRTS design for assessing juvenile abundance. IDFG does redd surveys in both MaSAs but none in Expand redd surveys to include the • • Spatial distribution the 2 MiSAs. Warren and Crooked River MiSAs. Data collected from fish sampled at weir, juvenile Genetic baseline needs to be maintained Implement a 5-year rotating panel • • traps, and spawning ground surveys. at regular intervals. to collect baseline genetic Species diversity Adult age and diversity data 1999-2008 available samples. • from NPM. Little Salmon River Population IDFG determines hatchery and natural returns to the Weir is 100% efficient. No redd surveys done except in Slate • • • Rapid River Hatchery weir. Only natural-origin fish Accuracy of GSI to identify this Creek. • are passed upriver of the weir. Hatchery fish are held population needs to be Need more accurate and precise adult • Adult abundance at Rapid River Hatchery for broodstock. determined. abundance data (increased redd NPT does a multi-pass ground count in Slate Creek surveys, weirs, GSI). • for ISS study.
Juvenile productivity • IDFG has operated a rotary screw trap in SF Salmon River just upstream of adult weir since 1992 as part of ISS. • Juvenile migrant abundance estimated at traps using mark recapture. • Survival of juveniles to LGR estimated using PIT tags. • Smolt yield estimated for adults spawning upstream of hatchery weir using screw trap data and downriver PIT-tag detections. • rotary screw trap in mainstem SF upstream of EF SF Salmon River. • IDFG fixed site snorkel surveys done 1980 – 2006. In 2007 IDFG adopted a rotating panel probabilistic GRTS design for assessing juvenile abundance. • Screw trap 95% CI =4.8%-33.9% • Fish upstream of the trap may not be representative of the entire population. Spatial distribution • IDFG does redd surveys in both MaSAs but none in the 2 MiSAs. • Expand redd surveys to include the Warren and Crooked River MiSAs. Species diversity • Data collected from fish sampled at weir, juvenile traps, and spawning ground surveys. • Adult age and diversity data 1999-2008 available from NPM. Genetic baseline needs to be maintained at regular intervals. • Implement a 5-year rotating panel to collect baseline genetic samples. Little Salmon River Population Adult abundance • IDFG determines hatchery and natural returns to the Rapid River Hatchery weir. Only natural-origin fish are passed upriver of the weir. Hatchery fish are held at Rapid River Hatchery for broodstock. • NPT does a multi-pass ground count in Slate Creek for ISS study. • Weir is 100% efficient. • Accuracy of GSI to identify this population needs to be determined. • No redd surveys done except in Slate Creek. • Need more accurate and precise adult abundance data (increased redd surveys, weirs, GSI).