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576 U. S. BUREAU OF FISHERIES | 
greater percentage of its output to a larger size before releasing them. 
This recession was largely due to the fact that no humpback ‘salmon | 
eggs were taken, whereas last year 4,305,000 were collected during | 
the largest run of this species in the Skagit River in 25 years. The 
output comprised 4 species of trout and 3 varieties of Pacific salmon. 
No chum salmon were propagated. Twenty small concrete rearing 
ponds which had been in use since the origin of the station were dis- 
mantled, and an entire new concrete pond system consisting of 8 
ponds 13% feet wide by 56 feet long was constructed. The capacity 
of each pond is about 250,000 2- to 3-inch fish. Cottage No. 1 
was renovated and all other buildings repaired and painted. A new 
machinery shed 24 by 60 feet, with open front, was constructed for 
use in storing station machinery and equipment. 
The total number of eggs collected by the Clackamas (Oreg.) 
station and its auxiliaries amounted to approximately 22,700,000, 
as compared with 20,000,000 during the past year—an increase 
of nearly 12 percent. "This total was due to the abnormally large 
collections of fall chinook salmon eggs at the Battle Creek and 
Mill Creek (Calif.) substations. The collection of spring chinook 
salmon eggs was below normal at both the Clackamas and Butte 
Falls units. The low collection of eggs at the latter point is ascribed 
to the late installation of the headrack across Rogue River, which was 
due to the late runoff of snow water from the upper sources of this 
stream. A new permanent rack and trap in Butte Creek yielded 
more than 114 million steelhead trout eggs. However, the collection 
of silver salmon eggs from this body of water proved a complete 
failure. The Clackamas station supplemented its salmon work by 
handling brook and rainbow trout. The pond system at the Delph 
Creek rearing station was repaired, rearranged and enlarged. Con- 
struction of a frame hatchery building was started. At Clackamas 
the old combination workshop and * dwelling was remodeled. A 
laboratory building, 32 by 45 feet, for use by the Division of Scientific 
Inquiry, was practically completed. A chlorinating system was 
installed for the purpose of sterilizing the water supply before it 
enters the two reservoirs with the expectation that previous heavy 
mortality of fish would be eliminated. The two residences under 
construction at the Butte Falls station were completed during the year. 
The development of the hatchery at Carson, Wash., was continued 
under the auspices of the P. W. A. and W. P. A. and with the co-. 
operation of the United States Forest Service. This unit does not as 
yet have a pond system of sufficient capacity to rear its fish to a large 
size before releasing them. Plans have been drawn up for increasing 
the pond space. Chinook salmon and brook, rainbow, and black- 
spotted trout were handled during the year. All of the trout were 
assigned to the Forest Service for the stocking of waters under the 
control of that agency. 
Due to the development of the Bonneville Dam on the Columbia 
River, the Little White Salmon and Big White Salmon substations 
had to locate new seining grounds and clear the debris from such areas 
in order to facilitate the capturing of adult salmon. Nevertheless, 
the former station collected 20,443,000 chinook salmon eggs, which 
is a normal take, and the latter unit secured 18,250,000 eggs of this 
species, which was its largest collection since ‘the season of 1932. 
While the Little White Salmon station was solely engaged in the 
