PROPAGATION AND DISTRIBUTION OP POOD PISHES, 1926 365 



fingerlings in Grand Lake and its tributaries during September. It having 

 been noted that virtually all losses among the fish held in these canal ponds 

 occur during July, when the water is comparatively warm, steps were taken 

 to counteract this condition by providing a stronger flow of water through 

 the ponds, thus obviating sudden changes in temperature to a great extent. 

 Preparations for the collection of landlocked-salmon eggs were undertaken 

 on October 18, when arrangements were made to set trap nets above the 

 screen at the dam in Grand Lake. From the three trap nets operated 3.'!!> 

 female and 204 male landlocked salmon were taken, this stock yielding 

 799,400 eggs of good quality. The adverse weather encountered during the 

 fall tended materially to reduce the collections. An effort to obtain lake-trout 

 eggs in Grand Lake during the month of October met with complete failure. 

 High winds and rising water interferred with the nets and no fish were cap- 

 tured. From the stock of 175,000 brook-trout eggs transferred from the Craig 

 Brook station 166,000 fry were produced, all of which were distributed to 

 applicants with the exception of 5,000. These were on hand at the close 

 of the year. 



Green. Lake {Me.) substation. — On October 15 traps were installed in 

 Great Brook and Green Lake, and during the run of landlocked salmon in 

 these streams 30 male and 65 female fish were captured, from which 120,050 

 eggs of fine quality were taken. It being impossible to develop the eggs in 

 the water on hand at Green Lake, they were forwarded to the main station 

 to be incubated. 



St. Johnsbury (Vt. ) Station and Substation 

 [A. II. Dinsmorb, Superintendent] 



This field includes the work at the main station at St. Johnsbury and at 

 the York Pond (N. H.) substation located in the White Mountain forest 

 reserve. In the course of the fiscal year the substation at Holden, Vt., was 

 transferred to the division of scientific inquiry of the Bureau of Fisheries, to 

 be used as a base for conducting experiments in the feeding of fish and the 

 treatment of diseases of the Salinonidse. Operations at St. Johnsbury station 

 were -confined to the incubation of trout eggs and the distribution of the 

 fry hatched from them. The work at York Pond substation was principally 

 of a constructive type, though it included the handling of a comparatively 

 small number of brook trout. 



St. Johnsbury (Vt.) station. — As in the previous year, arrangements were 

 made to hatch brook-trout eggs collected at Darling Pond, Vt., the bureau 

 receiving as its share of the product one-third of the fry hatched. The usual 

 number of brook-trout eggs were purchased from commercial fish culturists, 

 and two local fishing clubs delivered a considerable number of these eggs to 

 be incubated at the hatchery with the understanding that the resulting fry 

 would be returned to them for deposit in certain public waters in the State. 

 The losses on stock obtained from commercial firms were somewhat above 

 normal, especially during the fry stage. About 1,343,000 eggs of this species 

 were handled during the season, and the output exceeded that of the preced- 

 ing year by more than 100 per cent. 



The usual lake-trout egg collections were made at Lake Dunmore in co- 

 operation with the State of Vermont during a period extending from October 

 25 to •November 3. The bureau's share of these eggs was incubated at the 

 St. Johnsbury and Holden stations, and the resulting fry were delivered to 

 applicants and planted in local waters. The station received a consignment 

 of steelhead-salmon eggs shipped from the Pacific coast, one of Loch Leven 

 trout eggs from the Bozeruan (Mont.) field, and another of landlocked-salmon 

 eggs from the Craig Brook (Me.) station. All of these were hatched success- 

 fully with the exception of the last-mentioned lot, on which there was an 

 unusually heavy loss. 



York Pond (N. H.) substation. — Development work on this project, which is 

 intended eventually to supply a large part of the brook-trout eggs the bureau 

 is now compelled to purchase, has been in progress whenever weather condi- 

 tions would permit. Work on the west branch of the diversion ditch was 

 greatly impeded by unfavorable weather. However, the clearing of the ground 

 and the excavation of about 1,400 feet of the ditch was accomplished during 

 the fall, and the work was resumed early in May. A road machine operated 

 by a tractor was secured, and with the exception of some high places the 



