REPORT OF THE COMMISSIONER OF FISHERIES. 23 
hardened in a small temporary battery at Ogdensburg, they were 
forwarded to the Cape Vincent station for development. The stock 
was further supplemented by 55,000,000 green eggs from the Swanton 
field, and from the two lots about 50,000,000 were hatched and dis- 
tributed in the public waters of the region. 
As in the Great Lakes, the pike-perch spawning grounds in Lake 
Champlain were covered with ice at the time the spawning of that 
species occurs during a normal season. However, large numbers of 
fully matured fish later ascended the Missisquoi River, and from the 
nets of the commercial fishermen there were secured eggs sufficient 
to stock the Swanton hatchery. 
The arrangements that have been in force on Lake Champlain for 
the past three years were again put into effect, three crews being 
operated, and all ripe female fish available were purchased of the 
fishermen and taken direct to the spawning station and stripped. 
Egg collections extended from April 17 to the end of the month, the 
number secured amounting to 374,075,000, of which 84,125,000 green 
and eyed eggs were utilized in fillmg applications and in stocking 
various Federal hatcheries. 
The water supply for the Swanton station is furnished by the village 
water company and is of excellent quality, but the quantity available 
for the work is at times uncertain. It having become apparent early 
in the season that the supply would be insufficient for the conduct of 
‘the hatching operations in the usual manner, steps were taken to 
install an electrically driven pump, and by this means the outflow 
from the fry tanks was run back to the upper supply trough and used 
over and over, a small quantity of fresh water being constantly added 
and a like amount of used water discarded. As far as could be 
observed, no ill effects to fry or eggs resulted from this arrangement. 
The incubation period was retarded by the cold, inclement weather 
pe paiine through May, but, hatching having once begun, all the 
ry came out about the same time, necessitating very rapid and con- 
stant work in making shipments to applicants and to public waters. 
For the purpose of effecting a wider distribution of pike perch in 
the southern sections of Lake Champlain than is possible when 
shipped from Swanton a cooperative arrangement was entered into 
with the Vermont fishery authorities whereby the Bureau agreed to 
construct and operate a portable hatchery at Burlington, Vt., the 
State to bear the expense of the undertaking. The plant, consisting 
of a 100-jar battery, a supply tank, and 2 collecting tanks, was 
gotten in shape and transferred in sections by the station launch from 
Swanton to Burlington, where it was set up on the dock of the Cham- 
plain Transportation Co. and covered with a canvas shelter. By 
means of pumps, driven by an electric motor, the water supply for 
the hatchery was conveyed from the lake to the supply tank installed 
on one of the dock buildings and from there conducted by gravity 
to the upper trough of the battery. About 30,000,000 eyed eggs, 
transferred from Swanton station, were successfully hatched in this 
outfit, and, as the water supply was of lower temperature than at 
Swanton, the hatching period was retarded sufficiently to make it 
Bossi’? to distribute the product after the fry at Swanton had been 
isposed of. The Bureau is indebted to the Champlain Transporta- 
tion Co. and to various owners of private motor boats, who rendered 
valuable assistance in effecting a wide distribution of the fry in the 
open waters of the lake. 
