40 U. S, BUREAU OF FISHERIES. 



cisco, and pike perch. In addition to these, carp and yellow perch 

 have become commercially prominent and lar<re numbers of theii- 

 eggs are hatched annually and the product returned as fry to parent 

 waters. The total eg^ collections of this group of stations in 19'2;-5 

 was approximately 1,082.000,000, showing a decrease of about 4G7.- 

 000,000 as compared with this branch of the work last year. The 

 largest part of this decrease occurred in the cisco and pike perch, 

 and the principal causes for it may be attributed to unseasonably 

 cold weather during the spawning period and lack of sufficient funds 

 for prosecuting the work to its fullest extent in some of the fields 

 occupied. Owing to the latter circumstance the pike-perch hatchery 

 at Swanton, Vt., was not operated. 



DULUTH ( MINN. ) STATION. 

 [S. P. WiEES, Superintendent.] 



Collections of eggs of the lake trout for stocking the Duluth 

 hatchery were made at the usual field stations in Lake Superior 

 chiring the fall, the spawning period extending from September 25 

 to November 15. Eggs to the number of 16,132,000 were secured, 

 and on November 25 this stock was increased by the receipt of 

 6,000,000 green eggs from the Charlevoix (^lich.) field. The eggs 

 from Lake Superior vrere of good quality, but for some reason the 

 transferred eggs were exceptionally poor. Eyed eggs to the number 

 of 525,000 were furnished to applicants, and 250,000 were forwarded 

 to other stations of the bureau ; the remainder were hatched and the 

 product returned to the spawning grounds in Lake Superior, the 

 distributions aggregating 13,170,000 frv and 85,000 No. 1 fingerling 

 fish. 



The whitefish eggs handled during the year — 5,060,000 — were col- 

 lected in connection with the lake-trout work at Isle Royale, Mich. 

 Notwithstanding the fact that they were secured under rather un- 

 favorable conditions, 2,770,000 fry of excellent quality were hatched 

 from them and returned as fry to the native spawning grounds. 



As a result of cooperative work between the station and the Minne- 

 sota Fish Commission in the collection of pike-perch eggs in the 

 Rat Root River region of Minnesota, the station received as its share 

 of the proceeds 25,000,000 eggs, 5,000,000 of which were eyed. The 

 green eggs, received May 5, appeared to be in good condition on 

 delivery, but within 48 hours after installation in jars it was dis- 

 covered that the loss w^ould be heavy as not more than 15 per cent 

 were fertilized. From the entire stock 7,630,000 fry of good quality 

 were hatched and distributed, going to applicants in Minnesota, 

 "Wisconsin, and Michigan. 



The brook trout listed in the distributions from the Duluth station 

 resulted from 147,000 eyed eggs acquired by purchase from a com- 

 mercial breeder, while the rainbow trout were carried over from the 

 hatch of the preceding year. A consignment of 100,000 steelhead 

 eggs, received from one of the bureau's substations in Oregon on 

 May 24, yielded a total of 90,000 fry and fingerling fish. 



Of passing interest in connection with the incubation of the lake- 

 trout eggs Vv'as the unusually large percentage of albinos resulting 

 from a lot of eggs obtained at Isle Royale, Mich. These eggs — about 



