180 Thirty-fourth Annual Meeting. 
mining the time of incubation to be five days at an average tem- 
perature of 63 3-5°, Fahr. 
With regard to the volume of water supplied to each pond, 
it may be anywhere from 200 down to ten gallons per minute, 
which latter is ample for the average pond to offset evaporation 
and seepage. In fact, it is much better to have a light flow, 
as the temperature will be higher, and it is considered that 
natural food will increase faster in the warmer water. Also at 
the spawning time it is absolutely necessary that as small a 
quantity as possible be used, that the temperature may be kept 
above the danger point on cold days of 54°. 
From conditions recently noted, one can conservatively say 
that a pond of seven-tenths of an acre, should, with the proper 
proportion devoted to spawning area, produce from 75,000 to 
100,000 fry on the average. This same area, with one-third to 
one-half that number of fry retained in the pond, should pro- 
duce from 10,000 to 15,000 fingerlings, with also possibly from 
1,000 to 3,000 to turn out in the fall at the final cleanup. 
In order to obtain the best results at a small mouth bass 
breeding station, the ponds should not be too large or too deep, 
but have plenty of them. It is preferable that they be from 
one-half to not over three-quarters of an acre in area, and a 
maximum depth of six feet in about one-quarter of the pond is 
best. It is thought that by removing one-half of the fry from 
a spawning pond used to its full capacity, practically as good 
results will be obtained with the number of fingerlings turned 
out, as though all the fry had been left, unless at some time in 
the future, greater quantities of food may be grown in a limited 
area. 
DISCUSSION. 
During the reading of his paper Mr. Clark said: 
I call these nests in my paper, the Lydell nest, because he 
invented them, and I want to give him the credit. 
We have our pond so arranged’ that whenever there is a 
“roil,’ which of course is considered fatal to the eggs on the 
nest, we can, by closing one valve and opening another, change 
from creek to spring water. This is very desirable in a bass 
pond, when you have the roil; and it forms the basis of a very 
seat 
