22 BUIyl^ETlN OF THE BUREAU OF FISHERIES. 



Tabids i6, — Young Chinooks from Point Eluce, Wash., Oct. i6, 1915. 

 specimens without intermediate growth. 



146 to 150 mm.. 

 141 to 145 mm. 

 136 to 140 mm. 

 131 to 135 mm., 

 136 to 130 mm. , 

 131 to 125 mm. 

 116 to I30 mm., 

 sii to 115 mm. 

 106 to no mm., 

 xoi to 105 mm., 

 96 to 100 mm. . . 



Total 



Av. 113. o mm. 



Length. 



Number 



Total. 



With 

 primary 

 check. 



Scale record. 



Number of rings- 



To check. Total 



9.0 

 9- 7 



10. 6 



11. o 



10. o 

 10. 8 

 10.3 



28.0 

 29- S 

 24. o 



23.8 



23-4 

 22. o 

 21. 7 



21- S 



Length of anterior 

 radius — 



To check. 



38.0 

 28.0 

 26. 7 

 30. o 

 32. 2 

 28.5 

 29. 6 

 26.3 



Total. 



78.0 

 70. s 

 63. o 

 61.7 

 S3. 3 

 58. o 

 55- 7 

 53- o 



59-8 



Average 

 estimated 

 length of 

 fish at 

 time of 

 formation 

 of check. 



63.0 



50. s 



55-2 

 61 7 

 59- o 

 54.0 

 47.1 

 SI- 3 



SPECIMENS WITH INTERMEDIATE GROWTH. 



In connection with the series just considered another collection made the following 

 day, October 17, 191 5, is of considerable interest. This second collection was made by 

 hook and line under one of the canneries located at Astoria, Oreg., the Union Fisher- 

 men's Cooperative Cannery. As has been already mentioned, fish taken under these 

 conditions are always found to be feeding heavily on the offal from the cannery. This 

 collection consists of 61 specunens, of which 43 (70 per cent) have scales which show 

 the intermediate growth. The average length of this collection is considerably greater 

 than for the Point EHice collection, 127.5 "^i"- The specimens which had begun the 

 rapid intermediate growth average 130.5 mm., and those which had not done so average 

 but 120.2 mm. All of the specimens whose scales do not show intermediate rings have 

 the narrow winter rings at the scale margins. Thirty-three males average 127.9 nirn- 

 in length and 28 females 127.0 mm. The following table (17) gives the data for this 

 collection : 



