REPORT OF THE COMMISSIONER OF FISHERIES. 19 
was found by the spawn takers detailed for the work. The material 
results of this experiment were, therefore, wholly negative, but the 
experience gained will doubtless be helpful in connection with any 
future operations which may be considered for that field. 
- Atlantic salmon operations on the usual scale were conducted at 
the Craig Brook, Me., station. In June of the previous year a brood 
stock of 725 fish had been purchased and transferred to the station 
inclosure until spawning time in October, when 1,953,400 eggs were 
yielded. Early in the winter consignments of eggs to the number 
of 1,770,400 were transferred to the subhatchery near the headwaters 
of the Penobscot River for development, and all of the fry hatched— 
1,709,815—were liberated in the east branch of that river durin 
May and June, 1916. The fish from which the eggs were derive 
were liberated immediately after spawning at the head of tidewater 
in Orland River. 
In the spring of 1916 the run of Atlantic salmon in the Penobscot 
was reported to be the largest since 1912, and no difficulty was ex- 
perienced in securing 1,031 adults to serve as a brood stock for the 
coming season, the number exceeding by several hundred the brood 
stock of the two previous seasons. The sentiment of the local fish- 
ermen has undergone an entire change, and they are now anxious 
to cooperate with the Bureau, whereas in past years many of them 
have been in doubt as to the value of its work with this species. 
FISH CULTURE IN THE GREAT LAKES, 
While the weather conditions prevailing at the Great Lakes sta- 
tions during the spawning season of the commercial fishes were not 
uniformly unfavorable, they seriously handicapped the work in some 
of the more important fields and caused a reduction of about one- 
fifth in the collections of lake-trout and whitefish eggs as compared 
with the previous year. The results of the pike-perch operations 
were more satisfactory, but the effects of an abnormally cold, late 
spring are clearly shown by the material shortages in eggs taken 
and fry planted. 
Beginning October 1 arrangements were made for the usual col- 
lections of lake-trout eggs in Lake Superior waters, field stations for 
the purpose being opened at Isle Royale, Maretuathe, Munising, 
Ontonagon, Jacobsville, and Keystone, on the Michigan shore, and 
at Grand Marais, in Minnesota. From these various points 23,070,000 
eggs of excellent quality were secured and also 2,668,000 whitefish 
eggs, all of which were forwarded to the Duluth hatchery for develop- 
ment. 
Of the lake-trout eggs 3,509,724 were shipped in the eyed stage 
to State and private hatcheries, all of the consignments reaching their 
destinations in excellent condition. The remainder were hatched 
and 14,390,000 fry were distributed during March and April. Asmall 
number of lake-trout fry were held and fed to the fingerling stage. 
This stock when distributed in early June numbered 211,000. 
The small collection of whitefish eggs was supplemented by the 
transfer of 25,000,000 green eggs to Duluth from the Lake Erie 
field in December, and dean the total stock of that species handled 
18,575,000 fine healthy fry were produced and planted in suitable parts 
of Lake Superior. In April 17,750,000 pike-perch eggs were trans- 
