How to obtain tt. III 
as shades for the fish, and it is desirable to allow the water to 
flow over some of the embankments of the ponds, while it passes 
underneath others. This is easily managed by having a few 
rough plugs well fastened to the end of a stout stick or piece of 
rail. A piece three inches by one inch will be found to answer 
well, and the wooden plug (Fig. 4) should be made so as to fit 
loosely into the flange of the pipe. 
B 
A 
\— 
ma 
H 
D 
Fig. 4. 
The handle AB acts as a lever in drawing the plug, and 
should be three feet long. When required place a similar piece 
of wood crosswise below the handle at the point D to act as a 
fulcrum, and holding it firmly, or even pushing it forward a little, 
while the end of the piece A is drawn back, the plug comes out 
of the socket of the pipe, and can then be lifted out. This 
answers well also for working the bottom outlets of the ponds. 
When the ponds have been prepared and the screens 
adjusted, and they are all in order for receiving young fish, the 
latter should be gently introduced at the head of the first pond in 
the nursery, and left to themselves. They will probably remain 
there for a time, but will soon scatter, and many of them will 
drop down from pond to raceway, and from raceway to pond, 
until they enter the river or lake. But they will have got 
thoroughly used to the water, and a number will remain in the 
ponds and raceways for a while, taking up positions where there 
are eddies and suitable currents. It is a good plan to feed them 
artificially for a time in these nurseries, and some people approve 
of placing a fine movable screen across the bottom of the pond 
into which they are at first turned. This prevents them dropping 
down stream too soon, and will often cause them to head up 
again, should they find their downward course checked by it. 
Under the care of a skilled fish culturist a large per centage of 
