REPORT OF THE COMMISSIONER OF FISHERIES. 7 
north side of Klamath River, and an undershot water wheel 28 feet 
in diameter, with 24 buckets, was installed on the river bank 5,350 
feet above the hatchery, the water being conveyed thereto through 
open flumes and ditches. 
FISH PROPAGATION ON THE GREAT LAKES. 
At the Great Lakes hatcheries the results of the work with the 
commercial fishes were in general satisfactory. While storms and 
sudden ice formation hampered fishing operations during the spawn- 
ing season, the losses in some fields were in most instances compen- 
sated for by unusual success in others, and the final outcome of the 
collecting season was an aggregate of 1,843,493,540 eggs of all species 
handled as compared with 1,634,591,880 during the corresponding 
season of 1914. Of this total 132,000,000 represented eggs of the 
cisco, or lake herring, the bulk of which were secured in Lakes On- 
tario and Superior, where the propagation of this desirable fish was 
undertaken by the Bureau for the first time in the fall of 1914. The 
egg collections of only one species—the common whitefish—fell be- 
hind those of the previous year, the total shortage in this instance 
amounting to about 42,000,000. The take of lake-trout eggs, on the 
other hand, was over 8,000,000 in excess of that in 1914, and there was 
a small gain in the collection of pike-perch eggs over last year. 
The lake-trout work in Lake Superior opened on September 24, 
and during the spawning season, which lasted 59 days, 16,247,000 
eggs of good quality were secured and transferred to the Duluth 
hatchery. This stock was supplemented later by the receipt of 
6,932,000 eggs from Lake Michigan fields, but for some reason the 
latter consignment was of exceptionally poor quality. On reaching 
the eyed stage, 500,000 eggs were shipped on assignment. The re- 
mainder produced 14,715,000 young fish, which were distributed dur- 
ing the spring on the spawning grounds where the brood fish were 
secured. 
The initial attempt to propagate lake herring at the Duluth sta- 
tion met with a fair measure of success so far as egg collections were 
concerned, but the quality of the eggs was impaired by unfavorable 
weather conditions during the spawning season and by the rough 
handling to which the fish were subjected on the fishing tugs prior 
to their delivery to the Bureau’s spawn takers. From the 32,000,000 
eggs laid down in the hatchery, there were produced only 9,750,000 
fry, which were returned in April to the spawning grounds in Lake 
Superior. 
During the season there were planted in sheltered waters of Lake 
Superior 16,400,000 whitefish fry, which originated from a consign- 
ment of 25,000,000 eggs transferred to Duluth from Lake Erie fields 
and from a collection of 810,000 eggs made near Isle Royal, Mich., in 
the course of the lake-trout operations. 
During April two lots of pike-perch eggs—one of 12,000,000 fur- 
nished by the Minnesota Fish Commission, and one of 20,000,000 
green eggs transferred from the Bureau’s Detroit station—were re- 
ceived and hatched at Duluth. The former consignment yielded 
4,000,000 healthy fry, but the remaining eggs were of such poor qual- 
ity that only 3,450,000 fry resulted from them. All of the pike-perch 
