cross counting board when lights are on. My own opinion is that it is a com- 

 bination of white board and bright lights. My theory is the kick back or 

 reflection from the board rather than the lights, is the cause of the turn backs, 

 It is possible that all turn backs are females, exercising a woman's perogative. 



5» After observing conditions in stilling pool water, the chamber was 

 b.^-af ted to Weir 65 where water conditions are typical of the ladders as 

 a whole. The chamber was first placed upstream of the weir, later down- 

 stream. As was anticipated, entrapped air greatly handicapped observa- 

 tions. Fish v/ere observed coming through, but indistinctly, and detail 

 was lacking, although all observers were agreed the velocity through 

 opening appeared less then Weir 68 (lower end of the stilling pool). 

 However it was proved that entrapped air does go to the bottom of the 

 pool. 



SDMMARY 



1, Consensus of opinion by observers is that injury just forward of 

 dorsal fin frequently observed by counters is not caused by underwater 

 orifices. This opinion is substantiated by observing fish in after 

 bay below power house. The fish clearly visible in taiiwater were 

 observed to be marked before entering ladders. 



The fish entering Bonneville Hatchery were also observed and the 

 same condition noted in about the same quantities as seen in the ladders. 



Most logical opinion expressed so far is, fish escaping from the nets 

 are injured in the process of doing so, 



2o My objection to orifices is, no place for fish to rest. 



Lack of any deposit of silt or debris indicates no still water in pools, 



From an operational standpoint they are excellent and very desirable, 



3o Stilling pool below counting station is desirable so far as allowing 

 fish to rest. 



That water below top of weir is practically free of current, and fish 

 move and maintain themselves with a minimum amount of effort. At times 

 there appears on the surface a great number of fish that would indicate 

 congestion, but underwater observation proves this apparent congestion to 

 be not true. 



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