582 U. S. BUREAU OF FISHERIES 
the river bank in front of the hatchery building was riprapped with 
rock. 
In the Idaho field the number of eggs taken from the brood stock 
at the Hagerman station was disappointing, due to the large number of 
barren females. The reason for this large percentage of barren females 
is not definitely known, but it is ascribed to diet. Experiments are 
being conducted to ascertain if this assumption is correct. Approxi- 
mately 1 million large fingerling trout were produced. The rearing- 
pond system was greatly increased during the year by W. P. A. and 
P. W. A. employees. 
The substation at Salmon, Idaho, which heretofore had been oper- 
ated on a seasonal basis, was operated during the entire year in coop- 
eration with the Idaho Fish and Game Department primarily for 
handling the rainbow eggs collected at Williams Lake and other local 
waters. Extensive repairs and improvements, including the rearrang- 
ing of the hatching and rearing equipment in the hatchery, were made 
during the winter. 
The distribution of rainbow trout from the Bozeman (Mont.) 
station was somewhat limited, due to the high mortality among this 
species during the latter part of the previous year. Normal success 
was attained with the other species of trout and grayling handled. 
Elk carcasses received from Yellowstone Park were utilized for fish 
food. This station was the beneficiary of P. W. A., W. P. A., and 
N. Y. A. projects which made possible extensive repairs and improve- 
ments to buildings, grounds, and equipment. 
The Glacier Park (Mont.) substation received 2,501,480 black- 
spotted trout and 400,000 rainbow trout eggs from the Yellowstone 
Park unit and planted the resultant fish in the advanced fry stage in 
Park waters. The water-temperature range is too great for successful 
hatchery operation at this pomt. In view of this and the need for a 
new and improved hatchery for producing larger fish for the stocking 
of waters of the Glacier National Park, an alternative site was located 
2 miles west of Creston. This unit, as planned, will consist of a 
48-trough hatchery building of frame construction, contaiming an 
office, laboratory, 2 lavatories, and a storage room. There will be 12 
concrete raceway ponds, each 107 by 10 feet; 10 Foster-Lucas concrete 
ponds of oval shape, each 56 by 1333 feet; 1 utility building and several 
residences. The grounds are to be landscaped and provision will be 
made for a picnic area which will be supervised by the Park Service. ~ 
The construction of this hatchery was started on March 1, 1939, under 
the auspices of the W. P. A., P. W. A., and N. P.S., with the Bureau 
furnishing technical advice. Due to adverse weather conditions 
and unforeseen constructional! difficulties the work is somewhat behind 
schedule, but it is anticipated that this station will be ready for opera- 
tion in the spring of 1940. 
The production of the Ennis (Mont.) substation was largely 
utilized in the restocking of waters of the Madison Valley watershed 
in an effort to reestablish the excellent sport fishing of the past years. 
The scarcity of adult rainbow and Loch Leven trout ascending the 
Madison River during the spawning season was more acute than ever. 
Consequently, this station had to rely on other sources for practically 
all of the eggs of these species. The major construction activities 
were erection of a four-room cottage, the extension of the water-supply 
main, installation of a hydroelectric turbine and generator unit, the 
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