390 Fisuinc mv American WATERS. 
side each three feet long, filled with narrow strips of glass, 
with the sharp edges ground off to prevent cutting the young 
tish. The glass is laid across the stream, forming gutters, in 
which the ova is placed in rows across the run of the water; 
the glass is supported in the frames three quarters of an inch 
from the bottom of the box, the water flowing freely both 
above and below the ova. These boxes are capable of hatch- 
ing at a time 15,000 salmon or trout. This season we have 
24,000 salmon eggs deposited in them, and the eges are be- 
coming quite visible. In depositing the ova in the several 
boxes, I keep each fish’s eggs separate, and marked on the 
boxes 1,2,3,ete. I keep corresponding numbers in a book, 
with a remark on each fish’s roe at the time of spawning; 
and during the time of incubation, if I see any thing worthy 
of notice, [take a note of the number and what has happened. 
I pick out all the dead ova once or twice a week, and keep 
an account of the number, and when the hatching is finished 
I subtract the number of the dead from the number deposit- 
ed, which will show about the quantity we have hatched. 
CARE IN OBTAINING FECUNDATED SPAWN. 
Whenever practicable, it is desirable to take the trout 
from the spawning-beds by means of nets, so as to insure the 
maturity of the ova, It can best be done in the night. So 
soon as caught, the fish should be placed in a large tub, or 
other vessel, partially filled with water, till a milter and 
spawner are taken. In ejecting the ova, the female should 
first be held over a bucket or large tin can half full of water, 
the lower end of the abdomen being inserted in the water, 
in order to prevent the exposure of the ova to the air, A 
gentle pressure of the hand from the thorax down each side 
of the abdomen will discharge the ova, if mature, without the 
least injury to the fish. The water in the bucket should then 
be reduced to three or four quarts previously to ejecting the 
milt of the male. In expelling the milt the course pursued 
is precisely the same as that just described, the lower end of 
