BUREAU OF FISHERIES 309 
for the collection of several hundred thousand eggs. While the work 
is of limited magnitude in comparison with the scope of the activity 
in earlier days, there is every reason to hope that the restoration of 
the Atlantic salmon is definitely under way. 
Commercial species, interior waters—With the transfer of the 
Put in Bay (Ohio) Hatchery activities to tiie control of the State of 
Ohio, the culture of Great Lakes species 1s markedly limited. A lim- 
ited number of lake trout, whitefish, and lake herring eggs were ob- 
tained for the Cape Vincent, N. Y., and Duluth, Minn., stations. 
At the latter point most of the lake trout eggs were supplied by the 
State of Michigan. The State also supphed lake trout fry which 
were transferred to the Charlevoix (Mich.) Station, which has been 
reconditioned as a rearing unit. Losses were heavier than was antici- 
pated, and the fingerlings were released before they had attained the 
desired growth. However, the effort was repeated during the spring 
of 1940, and at the close of the fiscal year approximately one-half 
million lake trout fingerlings were thriving and growing rapidly. 
It is believed that the planting of lake trout at a larger size will, to a 
large extent, compensate for smaller numerical output. 
The production of pike-perch was only a small fraction of the out- 
put of previous years, the reduction being due to the transfer of the 
hatchery on Lake Erie which has produced the bulk of the eggs of this 
species. Aside from the Great Lakes species, the commercial fishes 
of interior waters comprise mainly the carp, buffalofish, and catfish. 
Since the supply of carp appears to be holding up well, no effort was 
made by the Bureau to propagate that species during 1940. In the 
ease of buffalofish and catfish there was a significant increase in the 
plantings of eggs and fish. The buffalofish were planted almost 
entirely in the Upper Mississippi area. 
Game species —Inasmuch as the game and pan species of interior 
waters are subject to angling exploitation of increasing intensity, 
special attention was given to the culture of these species. All 
varities of trout were distributed in larger numbers, and in many 
instances in larger sizes. It has been recognized that smaller local 
waters, farm ponds, and State and county parks, if well stocked 
with common panfish, present a recreational asset of great importance 
to a very large part of the population. Consequently the produc- 
tion of the sunfishes, catfishes, and lesser game fishes has been aug- 
mented for the purpose of maintaining a supply of fish in waters 
which may not be frequented by the more ardent angler. Most of 
the new hatchery developments have been planned with this object 
in mind. Certain advances and improvements have been effected 
in hatchery technique, but the actual stocking of the waters them- 
