• Transportation studies indicate that sur- 

 vival of chinook and steelhead can be increased 

 from 10 to 400% by collecting juveniles at the upper 

 dam and transporting them to locations below 

 Bonneville Dam. 



The following areas were indicated by the 

 group as areas where research should be continued 

 or, if not already in progress, should be started. 



• Transportation studies should continue. 



• Survival data should be continually ob- 

 tained to determine changes in survival rates that 

 occur at various flows as spillway deflectors are 

 installed. 



• Additional horizontal and vertical distribu- 

 tion data are needed for both salmonid and resident 

 species to estimate what happens to the food chain 

 and predator-prey relations when the biomass is 

 subjected to varying degrees of exposure to super- 

 saturation of N 2 . 



• Additional data on tolerance of adult sal- 

 monids to supersaturation of N 2 are needed. Several 



species have not been tested and additional bio- 

 assays should be conducted. 



• Observations of the Kootenai River below 

 Libby Dam should continue to obtain data on degree 

 of recovery of the ecosystem after N 2 levels are 

 reduced. 



• Studies to define effect of long-term sub- 

 lethal exposures on survival and productivity are 

 needed. 



• Synergistic effects of other factors on toler- 

 ance to supersaturation are unknown and some 

 investigation is needed. 



A final general comment was made and gener- 

 ally agreed upon, and that was: "We have enough 

 information now to proceed with correction of the 

 problem and spillway deflectors should be installed 

 as soon as possible. There is little need to delay 

 installation while additional nebulous information 

 is obtained." 



Round Table Discussion 115 



