226 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Figure 2. — Release box with sliding gate closed. Hori- 

 zontal baffles and headbox are shown in background. 



Figure 3. — Recovery box with sliding gate removed. 

 Lead-in nets are shown in foreground; downstream 

 screens in the background. 



Figure 4. — Tattooing facilities. 



Figure 5. — Staggered electrode array used in this 

 experiment. 



current, supplied by a line transformer. Figure 9 

 is a block diagram of this modified equipment. 



Wiring patterns. — The two wiring patterns 

 tested are illustrated in figure 10. With each of 

 these patterns, the electrodes were energized by 

 the sequential switching equipment in such a 



