466 U. S. BUEEAU OF FISHERIES 



water level in this stream, however, most of the run of fish spawned in the Snake 

 River channel and less than 500,000 eggs were secured. 



Two consignments of rainbow-trout eggs — one of 105,000 shipped by the Idaho 

 State Fish Commission, and one of 25,000 transferred from the Meadow Creek 

 (Mont.) field — were hatched during the season and the product liberated as 

 fingerling fish in various waters of the region. 



Sandy River (Oreg.) substation. — The principal fish-cultural work at this point 

 consisted in the incubation of 1,000,000 chinook salmon eggs transferred from 

 one of the Oregon State hatcheries and the rearing of the product. The .voung 

 fish were released in the Sandy River in the Nos. 2 and 23^ fingerling stages. 

 A fair run of chinook salmon made its appearance below the dam in this river, 

 but as has occurred in previous seasons, the entire flow of water in the river 

 channel was diverted by the Portland Electric Co. for industrial use, and all of 

 the fish perished. During the spring traps were built in the fish ladder to inter- 

 cept the run of steelheads. The take of eggs of this species was small and of 

 inferior quality, and on the first of June it was decided to close the station for 

 an indefinite period. 



Baird (Calif.) Station and Substations 



The outcome of fish-cultural operations in the California field was very dis- 

 couraging, the egg collections as a whole being much smaller than in 1924 and 

 the output of young fish correspondingly smaller. The poor results are attributed 

 to abnormally low water stages in the streams at spawning time and unusually 

 muddy water, the latter condition being brought about by the deposit of volcanic 

 ash from Mount Shasta. 



Baird (Calif.) station. — At this station traps for intercepting the run of chinook 

 salmon in the McCloud River were installed early in August, 1924. Owing to 

 the low stage of the stream this was easy of accomplishment, but as the water 

 remained low throughout the spawning period only comparatively few salmon 

 were secured. The work of capturing adult fish was conducted from August 

 28 to October 16, though the bulk of the fish was obtained in late September. 

 Late afternoon was chosen as the time for spawning operations, experience 

 having demonstrated that better results are obtainable then. The collections, 

 totaling 1,200,000 eggs, produced 200,000 eggs in excess of the take of the pre- 

 vious year. On account of the prevailing drouth it was impossible to obtain 

 water from the usual source of supply for incubating the eggs, and they were 

 held in temporary troughs connected with a supply taken from a small creek 

 until they were nearly ready to hatch, when they were transferred to the hatchery 

 and a water supply secured by pumping. 



Because of heavy rains much difficulty was experienced in the work of placing 

 the rack for the spring run of salmon in 1925, and it was accomplished only 

 through strenuous effort. Shortly after its completion, a 75-foot section of the 

 structure was carried away by a heavy rainstorm, which continued unabated 

 for 60 hours. The break was repaired as soon as possible, though it could not 

 be made absolutely secure on account of the continued high water. 



Battle Creek (Calif.) substation. — -Arrangements were made early in the year 

 for the collection of chinook-salmon eggs in the Battle Creek tributary of the 

 Sacramento River. The work of seining the creek for adult fish was taken up 

 on October 21 and continued until the run was over on December 1, when opera- 

 tions were transferred to the main river, but as no material results were obtained 

 there the work was discontinued within a few days. As a result of the operations 

 in the creek and river 887,500 eggs were secured. In order to supplement the 

 stock in the hatchery, 500,000 eggs were transferred from the Mill Creek field 

 and from the aggregate lot 1,330,000 healthy fry were incubated. 



Mill Creek (Calif.) substation. — The drouth which prevailed in other parts of 

 the California field also interfered with the work at the Mill Creek substation 

 to the extent that the results attained were the most unsatisfactory in several 

 years. Fish-cultural operations were undertaken as usual in late October, 

 seining being conducted practically every day up to and including December 

 29. The eggs collected during the season amounted to 2,300,000, as compared 

 with approximately 3,000,000 in 1924. 



FISHES OF THE GREAT LAKES 



The success of the bureau's fish-cultural operations in the Great 

 Lakes region is dependent mainly upon the weather prevailing during 

 the spawning season of the species handled. The range of operations 



