472 U.S. BUREAU OF FISHERIES 



ously much greater. The Bureau's objectives in this field were in 

 general attained with gratifying success during the fiscal year 1933. 

 There was an increase in the output of 3 species of trout, grayling, and 

 practically all forms of pond fish. Of the latter the most important 

 was the largemouth and smallmouth black bass, and an output of 

 5,250,000 represents a healthy increase. Since the majority of the 

 fish which are distributed as fingerlings or larger come under the 

 category of game fish it is significant that the distribution of these 

 larger fish during 1933 increased 22.7 percent over the previous year. 

 Owing to the divergent nature of the activities it has been necessary 

 to make a division of a geographical character in reporting upon the 

 stocking of interior waters. 



ROCKY MOUNTAIN TERRITORY 



While there is a considerable number of trout propagated at the 

 hatcheries in the Pacific Coast States in connection with the main work 

 of replenishing the salmon runs, the chief game fish cultural work in 

 the West is conducted in the Rocky Mountain States and is very 

 largely concerned with trout. Summarizing briefly the activities in 

 this section it may be stated that the collections of black-spotted 

 trout eggs at Yellowstone Park, a temporary seasonal activity, were 

 about the average in number. This activity extends over two fiscal 

 years. Consequently the figures cover July, August, and September, 

 1932, and do not take into consideration the collections made durmg 

 May and June 1933. 



A limited number of grayling eggs were handled on an experimental 

 basis at Grebe Lake and the results were so encouraging that a perma- 

 nent hatchery of small capacity was installed at this point. 



At Mammoth Hot Springs operations were conducted as usual, 

 yielding a total of approximately three quarters of a million trout 

 fingerlings for distribution. 



The Leadville (Colo.) station and its substations at Creede and 

 Crystal Lake were operated as usual yielding the bulk of the brook 

 trout eggs collected at the western stations. The take of this species 

 in this field was in excess of 6,000,000. Concrete rearing ponds and 

 a dwelling were constructed at the Crystal Lake substation and other 

 improvements were made. 



At the Springville (Utah) station considerable work was performed 

 upon improvement of the hatchery spring water supply, necessitated 

 by apparent pollution which had resulted in heavy mortality during 

 the previous year. These improvements together with chlorination 

 of the hatchery water supply have apparently overcome this difficulty. 



There was constructed at Bear Lake, Utah, a substation intended 

 to be operated for the restocking of Bear Lake which extends into 

 Utah and Idaho. One million and two hundred thousand trout and 

 salmon eggs were incubated at this point. 



The hatching trough system at Springville was modified so as to 

 provide a more adequate water supply for each trough, and the fish 

 food or grinding room was remodeled. 



The operations at Saratoga, Wyo., approximated those of previous 

 years with the exception that the collection of eggs from station brood 

 stock and from field stations was reduced. 



