demand for the Delta-Mendota Canal will be at its peak in June and July,, 

 and outflow at this point will sometimes exceed outflow to the sea. During 

 the other months of this period outflow through the pumps will be equivalent 

 to one-third to one-half of the outflow to the sea. 



7. The evidence is conclusive that in order to protect and maintain 

 populations of king salmon, striped bass, and shad, positive means for 

 preventing their passage through the pumps must be adopted. 



RECOMMENDATIONS 



1. It is recommended as a result of these studies that a screen 

 be installed in the approach canal, complete with a fish-collecting 

 system and a by-pass canal that will carry screened fish to an area 

 beyond the influence of the Tracy Pumping Plant. The screen should be 

 of the travelling water type. The by-pass should originate at the screen 

 and terminate at Dutch Slough, and should have a capacity of 200 cubic 

 feet per second, the water to be pumped into the by-pass from the approach 

 canal. 



2. It is recommended that additional studies be made to determine: 

 (1) means of affording protection to eggs and larval fish; (2) further 

 effects of environmental factors in controlling fish populations in the 

 Deltaj (3) the behavior of adult king salmon, striped bass, and shad; 

 (k) the degree of success of the fish protective devices during all 

 stages of development and operation, and (5) the effects of altered 

 Delta environment on fish populations. 



3. It is recommended that the operation of the fish protection 

 devices be under the supervision of a competent fishery biologist. 



U6 



