44 



FISH HATCHERY MANAGEMENT 



A 



Figure 18. Piping and water flow arrangement in (A) 20-ft and (B) 5-ft diame- 

 ter circular tanks. The velocity and direction of water flow can be changed by 

 swinging the horizontal pipe toward or away from the tank wall, and twisting 

 the pipe clockwise to change the angle of inflow. The velocity is lowest when the 

 water is directed downward into the tank, as shown in (B). The bottom screen 

 plate and external head-box (arrow) eliminate vertical screens and standpipes in 

 the center of the tank. Note that only one automatic feeder is required per tank. 

 (FWS photo.) 



