THIRTY-FIRST BIENNIAL REPORT 59 



with this plan. One is to have a power company, now constructing 

 impassable dams in rivers near this district, construct a hatcherj' that 

 will be large enough for the entire district. The other plan is to have 

 certain reservoirs closed to fishing if conditions are favorable to raise 

 a stock of brood fish to supply the hatchery and to have it moved to 

 some centrally situated location where the work can be carried on 

 without interference and where the fish can be distributed throughout 

 the entire region by truck and pack animal. A plan to move the 

 Mormon Creek Hatchery during the fall of 1930 is contemplated and 

 plans are being made so that the work can be finished before the season 

 for shipping the fall eggs for that district. 



COLD CREEK HATCHERY 



The operations at this station during the last two seasons have 

 proven that the selection of this site was a good one. Considerable 

 work has been done in and around the hatchery since it was completed 

 in the spring of 1928. The grounds around the hatchery were leveled, 

 a brealrwater was constructed on the banks of Cold Creek to prevent 

 erosion during periods of high water, as the bank was being cut away 

 rapidly and in a few years would have caused damage to the hatchery 

 and grounds. The head trough or distributing tank was remodeled, 

 shrubbery and flowers have been planted, greatly improving the attrac- 

 tiveness of the grounds. An emergency pump to be operated during 

 the early spring when it appears necessary that the water supply for a 

 few weeks should be augmented by a flow that is free of algae should 

 be installed as the algae causes considerable trouble when it is running 

 in the creek before the warm weather sets in. It may be that one of the 

 filtration tanks that we are planning to install at many of the hatch- 

 eries will eliminate the trouble. A sand box and discharge gate in 

 main pipe line will be arranged for and built this coming fall. 



The fish have made a remarkable growth and have all been free of 

 infection, except a shipment of Atlantic salmon that were lost this 

 spring. The loss was attributed by the foreman to the algal growth in 

 the creek, but this has not been proven as the Atlantic salmon raised 

 at this station during the season of 1929 were exceptionally strong and 

 vigorous and were planted in Smith River without any noticeable loss 

 when they were from four to five inches in length. Reports from 

 Canada, where the Atlantic salmon are propagated on a large scale, 

 would indicate that they are a very difficult fish to raise, being non- 

 resistant to ordinary hatchery conditions and only with the greatest 

 skill can they be raised successfully. 



Next season experiments will be made at several stations, if we can 

 procure the eggs, to determine whether the Atlantic salmon can be 

 raised with ordinary hatchery methods. While we were very successful 

 with the first lot, reports would indicate that they are a very delicate 

 fish and are not resistant to certain pathogenic conditions either on the 

 Atlantic seaboard or in Europe. 



SNOW MOUNTAIN EGG-COLLECTING STATION 



This egg-collecting station, located on South Eel River, has been in 

 operation for the last 25 years. It has furnished during seasons of 

 normal rainfall a fine lot of steelhead trout eggs. Since the construe- 



