1. Lake Creek Chinook Salmon Performance Measures Paul Kucera and Chris Beasley Nez Perce Tribe/HDR FishPro

2. Purpose 3. Compare variation between the female per redd derived measure using abundance and redd count expansions 1.Present data to examine variation between adult salmon abundance data and redd count expansions 2.Compare variation between the juvenile per female derived measure using abundance and redd count expansions

3. Figure 1. Secesh River drainage.

4. Adult Abundance Project Goal: Accurately assess the spring and summer chinook salmon spawning migration in the Secesh River and Lake Creek on an annual basis (Escapement) Lake Creek Monitoring Projects Juvenile Abundance Project Goal: Determine chinook life history characteristics and estimate pre-smolt and smolt populations (ISS)

5. Adult Abundance Monitoring Lake Creek (Video) Flow

6. Juvenile Abundance Monitoring

8. Adult Salmon Abundance Lake Creek

9. Abundance Data Purpose is to Provide: Population Census Population Estimate

10. Idaho Chinook Salmon Redd Counts Purpose is to Provide: Index of Relative Abundance Trend Information Are one time index area counts conducted after the peak of spawning

11. Adult Salmon Abundance versus Redd Count Expansion Data

13. Juvenile per Female Data Abundance Data vs. Redd Count Expansion

14. Female per Redd Data Abundance Data vs. Redd Count Expansion

15. Adult Salmon Abundance versus Redd Count Expansion Data Johnson Creek

16. Summary Compared adult salmon abundance data with redd count expansion abundance estimates Redd count expansion abundance estimates were highly variable and not consistently biased (video) Redd count expansion abundance estimates were highly variable and not consistently biased (mark recap) Primary Measures:

17. Summary Juvenile per female estimates were highly variable at low population size (-55% fewer to 238% greater) Juvenile per female estimates were less variable (- 21% to + 25%) at larger population size Female per redd estimates were highly variable at low population size (-35% to + 122%) and not consistently biased Female per redd estimates were less variable at larger population size (- 2% to + 27%) Derived Measures:

18. Summary Redd count expansion techniques can provide highly variable estimates of adult abundance Redd counts are not a viable method in RM&E study designs for addressing abundance based Tier 2 or Tier 3 questions Alternative statistical analysis should be employed to determine if redd counts can be utilized given inherent variation and precision questions Consider alternative sampling designs or methods to obtain adult abundance information CSMEP Application: