PROPAGATION AND DISTRIBUTION OF FOOD FISHES, 1940 579 
1939 was completed, except for the necessary piping and troughs. 
Rocks were removed from the seining and trapping grounds on the 
river. 
The Birdsview (Wash.) unit, in addition to collecting eggs from its 
brood stock of rainbow trout, took eggs from wild steelhead trout 
silver, chinook, and humpback salmon. Chinook salmon. brook. 
rainbow, and blackspotted trout eggs were received from other sta- 
tions. During the summer months the hatchery was operated at full 
capacity. All runs of Pacific coast salmon were considerably below 
normal during the past year. y 
The Carson (Wash.) station handled brook and rainbow trout as 
well as chinook salmon. The latter species was handled largely to 
relieve crowded conditions at the Big White Salmon unit. The brook 
trout contracted western gill disease, and the resultant loss was rather 
heavy. The total output of trout was distributed by the Forest 
Service in waters of the Columbia National Forest. The chinook 
salmon were liberated in Wind River, a tributary to the Columbia. 
Chinook and silver salmon, and steelhead and rainbow trout were 
propagated at the Butte Falls (Oreg.) station. The station’s water 
supply pipeline broke on July 6, necessitating the liberation of all 
hatchery fish in Butte Creek. While over one-half million more 
chinook-salmon eggs were taken this year than last, the total collection 
of all eggs handled was approximately one-third greater than for the 
previous year. In addition to the new 80-foot span of bridge con- 
structed to support the hatchery water supply pipeline replacement, 
various minor repairs were made to buildings and equipment. 
The collection of eggs at the Clackamas (Oreg.) station and its 
substations was slightly less than half the number collected last year. 
The shortage is attributable in part at least to unfavorable weather 
conditions and the extremely low percentage of female fish in the 
chinook salmon runs of Mill Creek and Battle Creek, Calif. The 
take of spring chinook-salmon eggs was approximately one-third the 
take of fall eggs of the same species. The collection of silver-salmon 
and steelhead-trout eggs was very satisfactory, and salmon, rainbow, 
brook, and blackspotted trout were propagated. Experiments with 
the use of chlorine in the water supply at Clackamas indicate that 
0.35 part per million may be added without ill effects. Experiments 
were also conducted to ascertain the suitability of a new deep-well 
water supply to fish-cultural operations. The water was found to be 
relatively low in oxygen content, but it is believed that with proper 
aerating facilities it will be entirely satisfactory. A new hatchery 
building at the Delph Creek substation was completed. 
The substation at Duckabush, Wash., collected eggs from more 
species of salmon than last year, although the total take of eggs was 
somewhat lower. Early- and late-run chum, silver, chinook, and 
humpback salmon were trapped and spawned, and the carcasses taken 
to the Quilcene dehydrating plant for processing into salmon meal. 
Due to limited pond area, most of the fish were planted as advanced 
fry in adjacent waters. 
In addition to collecting chinook salmon eggs, the Big White 
Salmon substation handled brook and rainbow trout. This year’s 
collection of salmon eggs exceeded all previous records. Even though 
eggs were transferred to other stations, it was necessary to plant a 
large number of the salmon as advanced fry. The remainder were fed 
