PEOPAGATIOX AND DISTKIBUTI0I7 OF FOOD FISHES, 1921. 69 



The water in this portion of the kettle is more or less clear. If only 

 a few fish are desired, they can sometimes be dipped out with the 

 ordinary hand dip net. In some instances it has been found ad- 

 visable to put a cement walk around the outside of the kettle. This 

 enables the fish-culturist to dip the fish out with greater ease and 

 without agitating the mud on the earth bottom of the pond. 



When it is desired to draw the water entirely off the pond, it is 

 first lowered to about one-half its depth and the mud on the' bottom 

 of the kettle is stirred with a long-handled spade or broom until it 

 is well agitated, when the gate valve A is opened wide and it is 

 flushed out. After this the pond may be drawn down slowly and the 

 fish drawn into the kettle. When the earth bottom of the pond is 

 bare, there will be 1 foot of water in the kettle. 



A 6-inch gate valve is sufficiently large for a pond one-half acre or 

 less in area, an 8-inch valve for a three-fourths acre pond, and a 10- 

 inch valve for a 1-acre pond. 



jf SPECIFICATIONS. 



Gate valve A is flanged and bolted to companion flanges F on 

 nipple E\ which passes through the center of cement dam B. The 

 height of dam B is to correspond with the desired water level in the 

 pond. Should it be necessary to raise the water level, wooden dam 

 boards may be dropjjed in the slot ('. D is the screen made in one 

 or two sections, with a mesh in accordance with the size of fish to be 

 carried. The gate valve should be set low enough for the water to 

 drain out of the kettle //. Kettle // is constructed with end and side 

 walls 12 inches higher than the earth bottom of the pond. 



Preparatory to drawing down the pond for the removal of the fish 

 the water is lowered by opening the gate valve with extension rod J 

 to a point where it is possible to clean the bottom of the kettle with 

 a long-handled brush. The mud and roily water is flushed out by 

 opening the gate valve wide. 



In drawing down the pond after the water level drops below the 

 top wall of the kettle all water from the pond must enter at the side 

 sluices /. This leaves the water comparatively quiet in the upper 

 end of the kettle. The small fish seek that portion of the kettle and 

 may easily be removed with a hand dip net. 



}t\ater\(il in drain box. 



Sides 8 inches, bottom 6 indies ; total amount concrete, 50 cubic feet. 



Cement bags 12 



Sand cubic feet._ 22. .5 



Stone and gravel do 45 



1-2—4 mixture. Sand and broken stone 

 or screened gravel. 



Sides 6 inches, bottom G iriclies ; total amount concrete, 38 cubic feet. 



1-2-4 mixture. 



Cement bags 9 



Sand cubic feet__ 17 



Stone or gravel do 34 



FittinffH for drnin box. 



Pj-incli standard flanged gate valve, 

 fj-inch foinjrtinion flange. 

 6-inch nipple inches long. 



