114 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
The hatchery is a substantial board structure, 50 feet by 16 feet, stripped over the 
joints to make it tight, and shingled with spruce shingles. It is lighted with five win- 
dows facing the timber and entered by a door at either end, from which a platform leads 
to the shore. The hatchery fixtures consist of 8 troughs, 16 feet long by 16 inches wide, 
placed in pairs, each 2 pairs end-on, so that there are 2 sets of troughs running 32 feet 
in length, broken in the middle, the 2 lower pairs' in each set being 4 inches lower, 
allowing that much fall to the water for aeration. 
The water is conducted from the lake above the rapids in a V-shaped trough to 
the upper end of the building on the river side, and, after passing through a large 
sluice box i^acked as a filter and running across the heads of the hatchery troughs, is 
conducted through them. These troughs are made of planed lumber well coated with 
asphalt varnish, with 
sheet-iron partitions 
also coated with as- 
phalt, and are so 
arranged as to give 
sufficient space for 
handling the baskets 
and to permit the cir- 
culating water to pass 
Plan of Klawak Hatchery. ^^"der the partition at 
the head and over the 
one at the foot, thus percolating through the eggs; that is, there are two partitions 
separating each basket compartment. The uijper partition extends to the bottom of 
the trough and is of such height as to allow the water to flow over the top. The lower 
one is of such height as not to permit the water to flow over it, but is raised from the 
bottom of the trough so that the water flows under. They are regular Williamson 
troughs. 
On the bottoms of the troughs are small sheet-iron rests, varnished, which permit 
the baskets to rest upon them and clear the bottom by about 1 inch. The troughs 
have compartments for 56 baskets. The latter are of woven wire, 7 parts to the inch, 
and are 24 inches by 14 inches by 5 inches. The number of eggs placed in each basket 
here is 50,000, giving the troughs a capacity of 2,800,000. As the passageways are 
very wide, the capacity of the hatchery could very easily be increased a half, making 
it 4,200,000. The waste water is returned to the stream by iron pipes at the foot of 
the troughs. The hatchery was ready for work July 25. Early in July the first 
redfish were seen in the lake, and on July 25 fish were seen in the trap at the mouth 
of Half-mile Creek. On August 1 a ripe female was captured and stripped, and from 
that day there was a gradual increase in numbers until September 10, when they were 
at their height and 60 females were stripped. The last striiiping took place September 
14. Early in September heavy rains set in, causing the highest floods known at the 
cannery, and washing out the traps so that no fish could be obtained after the 14th. 
It is believed that under average conditions many ripe fish could be obtained after 
that date. 
The males first arrived in considerable numbers, followed closely by the females. 
It was noticed here, as in Redfish Bay, that there were more males than females. The 
total number of eggs taken during the season was 2,023,000, of which number about 
800,000 were hatched and the fry returned to the lake. There were about 4,000 eggs 
l« sa^'‘ — 
i n -i-i 1 1 1 1 III I iTm 
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