PROPAGATION AND DISTRIBUTION OF FOOD FISHES, 1921. 33 
species as the whitefish, lake trout, cisco, pike perch, and yellow 
perch, they also include brook trout, rainbow trout, and smallmouth 
black bass, which species are produced in limited numbers at several 
of these stations. 
DULUTH (MINN.) STATION. 
[s. P. Wires, Superintendent. ] 
The spawning season of the lake trout in Lake Superior fields, on 
which the Duluth hatchery depends for its stock of eggs, began about 
four days later than usual at nearly all points, the bull of the eggs 
being taken between October 17 and November 1, though in the 
vicinity of Isle Royale, Mich., small lots were secured at intervals 
from the last week in September to about the middle of November. 
The run of fish was irregular and the egg collections light, the total 
ageregating only 12,726,500, or little more than half the take of an 
average season. On account of unseasonable weather and water con- 
ditions, poor transportation facilities, and a lack of ice at some of the 
more isolated fisheries, the quality of the eggs obtained was so im- 
paired as to cut down the output of lake trout from this station to a 
total of 6,379,500, of which 175,000 were eyed eggs, shipped on as- 
signment to other hatcheries, 6,057,000 fry, and 147,500 fingerling fish. 
In the course of the lake-trout spawning season 940,000 white- 
fish eggs were collected in the Isle Royale field, and on January 6 
this number was augmented by the receipt of 10,000,000 eyed eggs 
of very good quality from the Put in Bay (Ohio) hatchery. The 
combined stock yielded an output of 9,600,000 fry, all of which were 
planted in good condition, in various parts of Lake Superior. The 
station also distributed the product of 150,000 brook-trout eggs re- 
ceived from a commercial hatchery in New England and two con- 
signments of rainbow-trout eggs, aggregating in the neighborhood 
of 100,000, the latter being transferred to the station from western 
hatcheries of the bureau. 
In cooperation with the Minnesota fisheries authorities the force 
of the Duluth station established and operated two field stations for 
the collection of pike-perch eggs during the spring—one on the Rat 
Root River and the other on Boy River, a tributary of Leech Lake. 
The bureau’s share in the proceeds of these operations amounted to 
13,680,000 eggs. At Boy River the work was not altogether suc- 
cessful, as more than 98 per cent of the fish taken had deposited their 
eges previous to capture. This may have been due to the unusually 
low water stages that obtained in the early part of the season, the 
fish not being attracted to the streams and spawning in the shallow 
waters of Leech Lake. 
NORTHVILLE (MICH.) STATION AND SUBSTATIONS. 
[W. W. THaypr, Superintendent. ] 
There was a further decrease in the number of whitefish and lake- 
trout eggs secured from Lakes Michigan and Huron, two causes for 
which are assigned—the State laws and inexperienced and unreliable 
spawn-takers. Under the present laws fishermen are permitted to 
use an unlimited number of nets during the fishing season and are 
not required to make any provision for the salvage of ripe eggs taken. 
