Methods of Fish Culture. 5 
perature during the whole year. 3d. There must be a good 
fall. 4th. The stream must not be liable to be washed out 
by floods during the severest storms. The old method of 
hatching the spawn on gravel is nearly obsolete. Wire trays, 
with the wires crossing each other at right angles one-tenth 
of an inch apart one way and half an inch apart the other, 
are probably the best for hatching trout or salmon-spawn upon, 
allowing the fish to fall through as soon as hatched. 
There are many ingenious devices for hatching, but if you 
have your eggs so that you can pick them over readily and 
keep them clean and exclude the light, it is the easiest part 
of fish-culture, providing your eggs are well impregnated. 
The watering-pot will keep the sediment off, and a liberal 
use of salt will prevent fungus from generating. After the 
eggs are hatched it is best to remove them to another trough, 
or rearing-box, where you have spread a half inch or more 
of fresh earth, and they will generally remain healthy until 
the sac is absorbed. If the season is as far advanced as the 
first of April, in the latitude of New York City, at the time 
the fish ‘begin’ to’ feed; it is just as well: to. turn. them out; 
providing you have a proper place to put them, and instead 
of ponds, they do as well or better in a small running stream 
of spring-water, with a pond at the lower end of the stream, 
where you can place a screen if you do not wish them to 
descend. 
Another method of raising trout was tried with success, 
by arranging the ponds in the fall, and selecting pairs of 
ripe trout at different times, for say ten days, and placing 
them in the pond where they would spawn. As soon as ‘the 
first pairs had spawned they were removed and others put in, 
until there were enough eggs in the pond to produce as many 
fish as were necessary to stock the pond or series of ponds, 
