642 



envisioned? Tests on potential congregation of predators will 

 none-the-less most likely be needed. 



7. We need to learn more about any potential hydraulic feature 

 of the pipe that could affect the fish. For example, will 

 turbulence cells be created at certain locations, perhaps where 

 water is added, and are these sites where the fish might fight 

 the current until they become exhausted? Will curves or bends in 

 the pipe cause the water to assume a helical flow pattern rather 

 than a laminar flow? If so, how fish react to this situation 

 would need to be tested. 



8. As with other by-pass and transport systems, there is always 

 the concern about imprinting and subsequent homing ability. We 

 need to learn more about how stress affects this process, but it 

 is an extremely difficult concern to address directly without 

 adult tag return testing. We will consider several laboratory 

 approaches . 



9. Are there other physical features of the proposed system of 

 which we are unaware that could affect fish? For example, are 

 there certain features that are needed to prevent the snagging of 

 large debris like trees? Do certain provisions have to be made 

 in certain locations so as not to interfere with navigation? 



General Methods: We will use our presently established 

 procedures to evaluate stress and recovery in appropriate tests 



