652 U. S. BUREAU OF FISHERIES 



fish. It will place the bureau in a position to greatly extend the 

 cooperative nursery work in various sections of the country, and the 

 scope of effective distribution by which the bureau endeavors to 

 overcome depletion of the game fishes in suitable waters Nvill be 

 enlarged. 



FISH FOOD 



Experiments conducted during the year at Pittsford, Vt., empha- 

 sized the fact that certain dried products in combination with fresh 

 meats can be used with results equal to or better than those obtained 

 when fresh meats alone are used. A fine growth and remarkable 

 coloration followed the feeding of trout on a diet of dried salmon 

 esss in combination with liver. 



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BLACK-SPOTTED TROUT EGG COLLECTIONS AT PYRAMID LAKE, NEV. 



Pyramid Lake, Nev., is inhabited by a strain of unusually large 

 black-spotted trout which spawn earlier in the spring than do most 

 of the other strains. For some years the State of Nevada collected 

 eggs in this field, but the lake is on an Indian reservation and the 

 work met with much opposition from the Indians, who had been 

 accustomed to net the spawning adults and sell them. The difficul- 

 ties encountered by the State from this source necessitated a discon- 

 tinuance of operations for a time. As the field was considered a 

 valuable source of black-spotted trout eggs, and as protection of the 

 adult fish appeared essential for the perpetuation of the species in 

 Pyramid Lake, collections were resumed in the spring. of 1931 by the 

 bureau, acting in cooperation with the State authorities, and about 

 4,900,000 eggs were secured. Thirty per cent of the resulting fry 

 will be returned to the lake as fingerling fish from 1)^ to 3 inches long. 

 The past season being the first that the bureau has operated through- 

 out the entire spawning period, precautionary measures to insure the 

 successful carrying out of the undertaking were effected with the 

 Indian Service, the Indians of the reservation, and the State of 

 Nevada. 



BASS PONDS AT CAPE VINCENT, N. Y. 



Past operations at this station have centered on activities connected 

 with the propagation of the lake fishes and trout. Within the past 

 two years ponds for the propagation of pond fishes, mainly small- 

 mouth black bass, have been constructed, and the Cape Vincent 

 station now constitutes the bureau's first completely equipped small- 

 mouth black bass rearing plant in the Northeast. Its output of that 

 species during ] 931 ranked next to those of the North ville (Mich.) and 

 Louisville (Ky.) stations. 



GRAYLING OPERATIONS AT GREBE LAKE, WYO. 



The grayling is known as one of the most beautiful and active 

 of game fishes. It furnishes some of the most interesting fly fishing 

 obtainable. It is little known, however, outside its natural ranges in 

 the northern Rocky Mountain and Great Lakes regions, since the 

 various attempts made to transplant it have met with little success. 

 Moreover, as young grayling are difficult to feed and handle during 



