256 BULLETIN OF THE BUREAU OF FISHERIES 



EXPERIMENT NO. 13. SALMON (IDAHO) HATCHERY, AUGUST. 19 24 



Eggs from: Little White Salmon River, 1923. 



Reared and marked at: Salmon (Idaho) hatchery. 



Mark used: Removal of both ventral fins and the adipo.se fin. 



Number marked: 50,000. 



Liberated: In the Lemhi River on August 22, 1924. 



Age: Approximately 11 month,s. 



A sample of fingerlings preserved at the time the remainder were Uberated 



22.2 

 averages 58.1 millimeters in length. The scales average .-^ millimeters in radius 



and have an average of 7.8 rings. The innermost three or four rings frequently 

 are conspicuously finer and more closely spaced than those nearer the periphery. 

 A typical scale from a fingerling of average size is shown in Figure 82. The size 

 and scale data are tabulated in Table 32. 



Table 32. — Chinook-salmon jiiigerlings marked at Salmon (Idaho) hatchery August 22, 192Jf 



Two 3-year-olds and sixteen 4-year-olds were recovered from this marking. Others, 

 which will mature in their fifth year, will return to spawn during the season of 1928. 

 The detailed data concerning the recoveries appear in Table 33. 



Table 33. — Chinook salmon markeil at Salmon (Idaho) hatchery during the fall of 192^, n>hcn ap- 

 proximately It months old, and recovered during the seasons of 1926 and 1927 



Date of capture 



1926: 



1927: 



Aug. 10 



During August. 



July 11 - 



.July 2.5 - 



.luly 28 



Aug. 12.. _ 



Aug. 13 .... 



kMg. 16 



Aug. 17 



Aug. 17 - 



Aug. 17 



Aug. 20 



Aug. 23 - 



.\Ug. 24 



Aug. 25- 



Ku%. 25 



.\Ug. 25 



During September. 



Place of capture 



Astoria cannery. 

 Cathlamet 



Ocean.. 

 .do. 

 do- 



■|" 



Bwaco cannery 



Astoria cannery... 

 Altoona cannery.. 



do 



Chinook cannery.. 

 Astoria cannery... 



do 



do - 



Dwaco cannery 



Astoria cannery... 

 do.- 



do.- 



do 



Scale record, first year 



Number of rings 



To first I Total 



incidental, stream 



check I growth 



Inter- 

 mediates 



Length of anterior radius, 

 in milllmetersX120 



To first 



incidental 



check 



Total 

 stream 

 growth 



Inter- 

 mediates 



74 

 





 .=)6 

 .W 

 63 





 76 

 M 

 61 

 67 

 00 



