PROPAGATION AND DISTRIBUTION 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. a 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. 
Ro J SPECIFICATIONS, 
Gate valve A is flanged and bolted to companion flanges F on 
nipple Z’, which passes through the center of cement dam B. The 
height of dam & 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 dropped in the slot C. 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 7. Kettle 7 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 7. 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. 
Material in drain bor. 
Sides 8 inches, bottom 6 inches; total amount concrete, 50 cubic feet. 
m 2 
oat ae PL caret ag oa 5 | 1-24 mixture. Sand and broken stone 
Stone and gravel________ dovest) 45 or screened gravel. 
Sides 6 inches, bottom 6 inches; total amount concrete, 38 cubic feet. 
Mement (2.4 2t1 Ben eee bags__ 9 
Singhs La hr aes eee eubie feet__ 17 | 1-2-4 mixture. 
Stone or gravel___________ do-= = +34 
Fittings for drain boe. 
6-inch standard. flanged gate valve. 
6-inch companion flange. 
6-inch nipple 6 inches long, 
