478 U. S. BUKEAU OF FISHERIES 



carried in the station ponds. The losses on some of the eggs were above normal, 

 notably on the consignments from the Utah and Colorado fields, which sustained a 

 mortality in the egg and early fry stages of 152,000 and 190,500, respectively. 

 The eggs from Leadville were unusually small in size, and the losses were largely 

 increased by the fact that the eggs were practically at the hatching stage when 

 received. The product of this lot was distributed during the spring, but the fry 

 resulting from the Utah consignment were being carried at the close of the fiscal 

 year. 



In November and December several shipments of Loch Leven trout eggs, 

 aggregating 1,393,000 eggs in round numbers, were received from the Meadow 

 Creek (Mont.) auxiliary. Of these, 598,000 were immediately repacked and 

 shipped on assignment. The remainder produced 509,000 fry, some of which 

 were distributed in May and June. A small lot of landlocked-salmon eggs, 

 received in March from the bureau's Craig Brook (Me.) station, was successfully 

 incubated. It is the intention to plant the young fish of this species in a lake in 

 Montana in the hope of being able eventually to develop a collecting field for eggs. 

 The incubation of 1,391,000 rainbow-trout eggs received from the Madison 

 Valley field was completed during Ma}^ and June, the losses in hatching amounting 

 to slightly more than 4 per cent. 



Meadow Creek {Mont.) substation. — Preparations for the season's fish-cultural 

 operations in this field began in September with the installation of traps at 

 several points in Odell Creek for the capture of Loch Leven trout. While good 

 weather lasted large collections of eggs were made every day between October 

 13 and November 15, on which date the work was brought to a sudden close by 

 the weather turning cold. Of the 11,750,840 eggs obtained, approximately 90 

 per cent were shipped in the eyed stage, some for supplying applicants and some 

 in exchange for eggs of other species. 



The rainbow-trout spawning season in this field opened on March 20, fully 

 two weeks in advance of any previous season since the station was established. 

 Eggs were obtained daily from that time until May 21, 3,991,000 of exceedingly 

 fine quality being secured. A considerable number of rainbow trout and nu- 

 merous grayling were captured in several experimental traps installed in various 

 channels of the Madison River near the head of Meadow Lake. Their eggs were 

 not mature, however, and the current was too swift for the retention of the fish 

 in pens to ripen. Approximately 50 per cent of the fry resulting from the col- 

 lections were released in parent waters, the Madison Valley Anglers Club and 

 the deputy State warden of Montana assisting in the distribution. 



In pursuance of an arrangement effected with the Montana fisheries authorities, 

 whereby the resulting fry were to be liberated in Meadow Creek and other waters 

 in the Madison Valley, this substation incubated in excess of 5,220,000 grayling 

 eggs and 990,000 black-spotted trout eggs and planted the product. 



Glacier Park (Mont.) substation. — After carrying to the fingerling stage the 

 342,000 rainbow-trout fry on hand at the beginning of the fiscal year, the product 

 was turned over to the local park authorities for distribution in the waters of 

 Glacier Park. A consignment of 484,000 eyed black-spotted trout eggs was 

 received in July, 1924, about half of which were planted in some of the more dis- 

 tant and inaccessible waters near the top of the continental divide. The re- 

 mainder were incubated and the product planted as fingerling fish in park waters. 



During the spring of 1925, 551,000 eyed rainbow-trout eggs were received 

 from the Meadow Creek field. These were hatched with a small loss, leaving 

 approximately 537,000 iry in the hatchery at the close of June. Green black- 

 spotted trout eggs to the number of 940,380 were received early in June from the 

 Georgetown hatchery of the Montana Fish and Game Department, with the 

 understanding that an equal number would be returned to the State from the 

 Yellowstone Park collections later in the season. About the same time 1,027,000 

 green grayling eggs were received from the State in exchange for Loch Leven 

 eggs to be supplied later. 



Leadville (Colo.) Station 



[C. H. Van Atta, Superintendent] 



The work at this station is concerned mainly with the production of brook trout. 

 It differs from that at most of the other brook-trout stations in that the supply 

 of eggs is derived almost entirely from collections made on a share basis from 

 privately owned lakes and reservoirs. From five projects located within a 

 radius of about 150 miles from the station over 6,000,000 brook-trout eggs 



