REPORT OF COMMISSIONER OF FISH AND FISHERIES. 13 
BOZEMAN STATION, MONTANA (JAMES A. HENSHALL, SUPERINTENDENT). 
In August and September the fish that had been carried through the 
summer were shipped to applicants in Montana, Idaho, Oregon, and 
Washington, the distribution being made principally by one of the ears. 
In November 108,000 brook-trout eggs were collected from the brood 
fish at the station. In addition to these, 100,000 were received from 
Spearfish, S. Dak., and 88,000 from Leadville, Colo., making a total of 
296,000. During the spring it became necessary to remove the fry 
hatched from these eggs to the nursery ponds, in order to make room 
for the grayling and native-trout eggs, and the consequent loss was 
considerable, but the fingerlings on hand at the close of the year were 
healthy and growing rapidly. 
The eastern brook trout at this station are subject to a peculiar 
disease when they reach the age of two years, and at spawning time 
it is very pronounced. It commences with the formation of eneysted 
tumors on the lower jaw, usually at the end of the mandible; this is 
succeeded by a slimy condition of the entire body in some cases, with 
engorgement of the gills, though in others the fish seem to be quite 
normal with the exception of the tumors. <All the specimens affected 
have died, about 30 per cent of the 2 and 3 year old fish having been 
lost. Asno other species has been similarly affected it is thought that 
the disease is inherent and not due to local conditions. 
During the winter the usual arrangements were made for collecting 
eggs of the native trout at Henry Lake, Idaho, and grayling eggs at 
Redrock, Mont. The season at the former place did not result as suc- 
cessfully as heretofore, only 750,000 eggs being secured, as against 
1,440,000 in the season of 1900. This was attributed to scarcity of 
fish, 50 tons of trout having been taken from the lake and shipped the 
previous winter. ‘Thestation was opened on April 4, and the first eggs 
were taken on April 22. The 592 fish handled yielded an average of 
~1,235 eggs. About 370,000 of the eggs were transferred to Bozeman, 
150,000 were shipped to other points, and 115,000 fry were hatched and 
planted at the lake. The last eggs were taken at this place on June 3. 
At Redrock Lake, where Mr. G. H. Tolbert was in charge, a new 
and larger trap was put in lower down the creek and a new dam was 
built. On account of the cold backward season, the run of grayling 
commenced later than usual, but the fish were very numerous, and it 
is probable that twice as many eggs as were taken might have been 
secured had it been desired. Operations at this point began April 
4th and closed June 21st, 2,400,000 eggs being secured. From these, 
1,562,300 fry were hatched and planted in the lake and its tributaries, 
526,000 eggs were transferred to Bozeman, and 390,000 were shipped to 
other points. The spawning season lasted from May 11 to May 23. 
The eggs transferred to Bozeman hatched between June 7 and 29, 
producing 293,000 fry, an unusually good percentage. 
If the washings from an emulsion of fresh liver are fed to the fry 
