PROPAGATION AND DISTRIBUTION OF FOOD FISHES, 1922, 41 



Champlain were operated with an aggregate output of about 1,040,- 

 000,000 eggs and fry of the commercial species. This figure inckides 

 the whitefish, cisco, lake trout, pike perch, yellow perch, and carp. 

 Smaller numbers of brook trout, rainbow trout, and small-mouthed 

 black bass were also produced, as indicated in the table on page 12. 

 The output of these stations for 1922 is smaller by approximately 

 120,000,000 than in 1921, the principal difference appearing in the 

 output of pike perch. The yellow perch was propagated also at the 

 Bryans Point (Md.) substation. 



DULUTH (MINN.) STATION. 

 [S. p. Wires, Superintendent.] 



Lake-trout egg collections were made at various points on the 

 south shore of Lake Superior and at favorable points along Isle 

 Eoyal as in previous years. The spawning season opened at Wash- 

 ington Harbor, Isle Royal, on September 25, and closed there about 

 November 15, the collections at all stations being about 22,250,000. 

 All of these were incubated at the station except 1,000,000 that were 

 delivered to the Minnesota State hatchery, located at French River. 

 Unfavorable weather conditions which prevailed for a time during 

 the height of the spawning season resulted in an egg collection some- 

 what below the average in quality, but entirely satisfactory other- 

 wise. The resulting eyed eggs, fry, and fingerlings were in excellent 

 condition when delivered to messengers for distribution. 



A total collection of 22,500,000 whitefish eggs from the Put in Bay 

 collecting field were received, and nearly 4,000,000 more were pur- 

 chased from Isle Royal fishermen at 40 cents per quart. The egg- 

 collecting period of this species extended from October 25 to Novem- 

 ber 10, and, as in the case of the lake trout, much unfavorable weather 

 prevailed during almost the entire spawning period. However, the 

 quality of the eggs as a whole was fairly good, the greatest loss 

 occurring from one lot of about 4,250,000 produced by the field sta- 

 tion at Toledo, Ohio. The loss sustained from this particular lot 

 was a factor, of course, in reducing the percentage of hatch among 

 the whitefish eggs. The percentage of hatch of lake trout was about 

 56 and of whitefish about 66. 



Because of a lack of funds pike-perch propagation was not under- 

 taken in Minnesota waters as has been customary, and of the limited 

 collection of eggs of the species in other fields none were available for 

 transfer. Eyed brook-trout eggs to the number of 150,000, procured 

 by purchase from commercial hatcheries, were hatched with only 

 ordinary loss (about 5 per cent) and 100,000 rainbow-trout eggs 

 that were transferred from the Bozeman (Mont.) station were 

 hatched with a loss of less than 4 per cent. At the end of the fiscal 

 year 90,000 fingerling rainbow trout No. 1 were on hand for dis- 

 tribution. 



NORTHVILliE (MICH.) STATION AND SUBSTATIONS. 

 [W. W. Thayeb, Superintendent.] 

 NORTHVILLE (MICH.) STATION. 



From the stock of small-mouthed black bass carried over from the 

 previous year some 21,000 fingerlings No, 3 were distributed, and the 

 hatch of this species for the fiscal year 1922 was estimated at 200,000. 



