1. New Science – New Regulations Bruce Herbold (EPA) IEP and POD Management Teams

2. Fall abundance in 2008 continued low for all POD fishes. Source DFG 2008 Fall MW Trawl No sampling 1974 and 1979

3. FISH ABUNDANCE PHYSICAL & CHEMICAL FISH HABITAT Prior Fish Abundance TOP-DOWN BOTTOM-UP Water Diversions Predation Food availability Food quality Temperature Turbidity Salinity Contaminants Disease Toxic algae SAV

4. Fish Facilities Provide Data on Numbers Salvaged Up to 35-65 Percent of Delta Inflow Water Project Losses

5. Striped Bass Delta smelt Longfin smelt Winter Salvage (Nov-Mar) 949698000204 Threadfin Shad 250,000 2,500,000

6. Fall abundance in 2008 continued low for all POD fishes. Source DFG 2008 Fall MW Trawl No sampling 1974 and 1979

7. Old and Middle Rivers as an Integrator of Hydrodynamic Effects Old River Middle River

8. 1993-2005 Mean Values for December-March Negative Old & Middle River Flows Apparently Increase Adult Delta Smelt Entrainment Source: Source Lenny Grimaldo (In Review) r 2 = 0.31, p<0.05 Delta Smelt SWP & CVP Salvage (log count) Combined Old & Middle River Flow (cfs) 1993-1999 2000-2005

9. “First Flush/turbidity spike” Winter 14 days of OMR -2000 cfs

10. Spawning (temp<12 C) Late Winter-Spring OMR -3500 to -5000 cfs

11. Downstream Movement (temp 12-25 C) Spring OMR -1250 to -5000 cfs

12. Typical Distribution Source: Sommer et al. In review Fall Wet year outflow 7000-11,000 cfs Rearing ( about 1 ppt salinity)

13. FISH ABUNDANCE PHYSICAL & CHEMICAL FISH HABITAT Prior Fish Abundance TOP-DOWN BOTTOM-UP Water Diversions Predation Food availability Food quality Temperature Turbidity Salinity Contaminants Disease Toxic algae SAV

14. Fall “habitat quality” deteriorated Striped bass Delta smelt Source: Feyrer et al. (CJFAS 2007)

16. Fall EQ + Fall Abundance predicts juvenile production Fall “habitat quality” matters to the delta smelt population

17. Increased outflow = more longfin smelt. Fall Midwater Trawl Upper Estuary – relation changed Lower Estuary – relation unchanged Bay Study Otter Trawl Pre-clam Post-clam POD years Source: Randy Baxter, DFG

18. b a Where the smelt are in the bay

19. Other habitat stressors Bioassays showed little effect (<5 %) in 2005 or 2006. <15% adult delta smelt impaired 100 % of young striped bass show multiple infections Little evidence of toxicity Source: Inge Werner, Swee Teh, and Dave Ostrach (UCD)

21. Sewage Treatment Plants POD & Nutrients Example: Ammonia pollution Increasing Ammonia levels in Delta and Suisun Bay Potential Ecosystem Effects

22. ~ 90% of the Ammonia Load at Hood comes from the Sacramento Regional Wastewater Treatment Plant Sources: A. Mueller-Solger, DWR; A. Jassby, in press SFEWS

23. Widespread blooms of the toxic alga Microcystis in 2007 Core Habitat of Delta Smelt August Levels: 1.3 million cells/mL Source: Peggy Lehman (DWR) Microcystis grows well on ammonia! (Diatoms don’t)

24. July August 2007 Microcystis bloom and smelt effects L55 Fish & zooplankton collection August Microcystis bloom Sept delta smelt distribution

25. Alternative Life Histories FallWinterSpringSummer Liberty Island % catch 40 0

26. FISH ABUNDANCE BOTTOM-UP Food availability Food quality A Major Emphasis on Habitat Restoration to Boost the Delta Food Web BUT… only local effect likely

27. FISH ABUNDANCE PHYSICAL & CHEMICAL FISH HABITAT Prior Fish Abundance TOP-DOWN BOTTOM-UP Water Diversions Predation Food availability Food quality Temperature Turbidity Salinity Contaminants Disease Toxic algae SAV

28. Delta Smelt Zooplankton (Jul-Oct) Source: Wim Kimmerer (In review) Food Affects Summer Smelt Survival But Recent Levels Were Not Remarkable

29. Stock - Recruitment Effects Delta smelt Threadfin shad Juvenile Production POD Years

30. Have Delta Smelt Dropped Below Critical Population Levels? Adults (FMWT) Juvenile (TNS) Source: Anke Mueller-Solger (DWR) Recent Trend

31. Striped Bass Revisited

32. What’s Wrong With This Picture? Age-O Adults Townet index Adult abundance (1000) Juveniles Adults

33. What Happened To All Of The Mamas? Percent Females Gill Net Sampling 40 30 10 20

34. Effect of Sex Shift on Population? Petersen Estimates Adults

35. Gill Net Sex Ratio Applied to Petersen Estimates Effect of Sex Shift on Population? Petersen Estimates Adults

36. Flow Phosphorus Ammonia Temperature Contaminants “Harvest” turbidity Clams Jellyfish Edge and benthic fish Microcystis Aquatic Weeds Low and Constant Limited Lots Warm High Low Highly variable Lots Little Cool Low High Diatoms Pelagic fish Natives thrive Resists invasions