716 U.S. BUREAU OF FISHERIES 
A shipment of lake-trout eggs was received from the Duluth (Minn.) station. 
~ A portion of these was distributed in Colorado waters, leaving 43,000 on hand at 
the close of the year. A shipment of steelhead eggs was received from Oregon, 
and the fish were planted in waters of the Mount Massive Trout Club. At the 
close of the year the station had on hand more than 4,412,000 trout of the differ- 
ent species. 
YELLOWSTONE NATIONAL PARK (Wyo.) SUBSTATION 
[C. F. CULLER, in charge] 
The period covered by this report opened in the latter part of the fiscal year 
1926 and ran through the early portion of the fiscal year 1927. The season’s 
output was increased notably over that of 1925, the collections amounting to 
17,000,000, as compared with the previous figure of approximately 11,500,000. 
While the collections have not been brought up to the earlier records, a gratify- 
ing increase is noted. The season opened unusually early, with the first eggs 
being secured on May 16, apparently a record for this field. The quick melting 
of the snows brought on high water, and several racks were washed out. It was 
noticeable that certain streams, which formerly yielded an abundance of eggs, 
declined to the point where their output was negligible. Examination showed 
that very few fish ascended, but no explanation is forthcoming as to why the run 
should have diminished in spite of the plantings that have been made repeatedly. 
The bulk of the take was from the South Arm and from Chipmunk and Grouse 
Creeks. The percentage of fertility was lower than in previous years; it is be- 
lieved that vibration caused by work carried on in the hatchery was partly to 
blame for the greater mortality. No further returns from the fish tagged in 
1925 were noted, and no inferences could be drawn from such meager data. Men- 
tion should be made again of the hearty cooperation extended by the superin- 
tendent of the park and the employees of the park service. Much of whatever 
success has been attained is due to the assistance received from these sources. 
SaratToca (Wyo.) STATION 
[S. M. AINsworTH, Superintendent] 
The year opened with 164,000 brook-trout fingerlings, 159,400 Loch Leven 
fingerlings, and 129,000 rainbow fingerlings on hand. <Astation brood stock of 
brook trout has been built up, yielding 357,000 eggs, in comparison with 131,000 
the previous season. The Big Creek Lakes field station furnished over 1,250,000 
eggs of this species, more than three times as many as were secured the previous 
year. All eggs were of good quality, and a satisfactory hatch was achieved. 
An increased number of Loch Leven eggs (415,000) was secured from the station 
brood stock, and these showed the very high percentage of hatch of 98. Almost 
2,300,000 rainbow eggs were secured from wild fish in the Lost Creek field, a 
marked increase over last year’s collection. From the Yellowstone Park opera- 
tions 300,000 black-spotted trout eggs were transferred to the Saratoga station. 
All of the eggs handled were hatched with very slight loss. _An ample propor- 
tion of these was reserved for return to parent waters, the State of Wyoming 
was supplied a considerable number, and shipments of eggs were made to other 
stations. There were on hand at the close of the year almost 1,000,000 fingerling 
trout of the species mentioned above. Attempts to develop a collecting station 
for native trout at Baby Lake were a failure, due to unexplained dispersal of the 
fish, but in all other respects the year’s work at Saratoga was very successful. 
SprarrisH (S. Dax.) STaTION 
[D. C. Boortu, Superintendent] 
During the past year improvements to the station property were continued. 
Fish-cultural operations were confined to brook, rainbow, Loch Leven, and 
steelhead trout, the egg supply being secured through purchase or exchange and 
from the station brood stock. 
The favorable cooperative arrangement with the State of South Dakota, 
whereby that State purchased over 1,000,000 brook-trout eggs to be reared at 
the Spearfish station on equal shares, was continued. The 5,000 yearlings from 
the previous season were turned over to the State. It also received 234,000 
fingerlings of the 1927 output, the remainder being held for October delivery. 

