10 REPORT OF THE FISH AND GAME COMMISSION. 
ern California. From this splendid new hatchery it is possible to stock 
a large part of the southern Sierras and southern California. The ege- 
collecting stations at Rae Lakes and Cottonwood Lakes will furnish a 
plentiful supply of eggs, 
The present finds our hatcheries and ege-collecting stations in a fair 
condition of repair. In a few instances additions and repair work is 
necessary. 
In that the problem of transportation has become increasingly diffi- 
cult to solve, owing to the great distances between the larger hatcheries 
and the streams in which fish are to be planted, we have decided upon 
a new policy. In the future a number of small hatcheries will be 
erected in suitable locations near the streams to be stocked, with the 
result that the fry will only have to be moved a short distance. Trans- 
portation in most instances can be cared for by auto trucks. The 
temporary hatchery placed on the Feather River and the contemplated 
Yosemite Hatchery form part of this proposed plan, 
The first hatchery under the new law which provides that companies 
building dams over which fishways can not be constructed must establish 
a fully equipped hatchery, is being built. The California~-Oregon 
Power Company will comply with all the provisions of the law and will 
establish a hatchery on Fall Creek, together with cottages for attend- 
ants, racks and traps, which will cost approximately $20,000. 
A great deal has been accomplished in preventing pollution of state 
waters. Through our efforts:much of the waste which heretofore was 
allowed to pass into state waters has been saved and treated for more 
valuable by-products, at the same time saving fish from destruction. 
Some of the larger quartz and copper mines have constructed dams to 
impound waste. Notably the Engels Copper Mine of Plumas County 
has spent $25,000 on work of this kind. An endeavor to stop the pump- 
ing of bilge water in the vicinity of the Farallon Islands, which resulted 
in the destruction of bird life, was successful. 
We have continued to enforce the screening of irrigation ditches 
with the result that hundreds of screens have been installed during the 
past biennium. Several large irrigation ditches have been successfully 
sereened with a rotary screen of large design, and a new ‘‘draper’’ type 
of sereen, invented by a former employee of this commission, has also 
proved successful in large ditches. Fifty-five different fishways have 
been surveyed, constructed and repaired during the past two years. 
Commercial Fisheries. 
The Department of Commercial Fisheries has felt that no more 
important work could be done at this time than the gathering of 
aceurate statistical data on the state fisheries, All future regulation of 
