Figure 21.--'I'he "wampus" in operation. 





Figure 22,--The water pump and air compressor in position to operate the "wampus**. 



sound at that distance proved ineffective, the 

 wampus was placed in its final position for 

 the systen-iatic trials; approximately 8 feet 

 from the fish, and 1.5 feet below the surface. 

 At no time, however, did the wampus noise 

 drive the trout entirely from section No. I in 

 a manner convincing enough to describe as 

 a scare. Diagrammatic results of the tests 

 with this equipment are shown in figures 23-27. 



For two exploratory trials the wampus was 

 taken to a midpoint in the counting structure 

 and suspended in section No. 4. Operating at 

 full power or capacity (water 150 pounds 

 pressure, air 100 pounds pressure), the com- 



bination of visual, audible, and mechanical 

 stimuli served to drive the trout from sections 

 4 and 5 into sections 3 and 6 (determined by 

 count). All the trout in sections 3 and 2 as well 

 as those in 6 and 7 turned to head into the 

 current from the sound head. 



This combination of stimuli, although pro- 

 ducing the desired end result, might not be 

 practical to use in rivers of large size and 

 high turbidity. A test of this type might be 

 simulated by using a submerged fire hose 

 to force the fish into one or the other extremes 

 of a pond. 



21 



