SEAWARD MIGRATION OF CHINOOK SALMON. 23 



Table; 17. — Young Chinooks from Under Cannery, Astoria, Greg., Oct. 17, 1915. 

 specimens without intermediate growth. 



SPECIMENS WITH INTERMEDIATE GROWTH. 



Length. 



176 to 180 mm. 

 171 to 175 mm. 

 166 to 1 70 mm, 

 161 to 165 mm. 

 15610 160 mm. 

 151 to 155 mm. 

 146 to 150 mm. 

 141 to 145 mm. 

 136 to 140 mm. 

 131 to 13s mm. 

 136 to 130 mm. 

 131 to 125 mm. 

 ii6to 120 mm. 

 Ill to 115 mm. 

 106 to no mm. 

 loi to 105 mm. 

 96 to 100 mm . . 



Total. 



Av. i30.smm^. 



With 

 check. 



Scale record. 



Average number of rings — 



To 

 check. 



Inter- 

 mediate 

 growth. 



9.0 

 9- 5 



10.3 



12. o 

 8-5 

 7- I 



10. 2 

 8.1 



10.3 

 8.9 

 9.0 



13.0 



23. o 



24. o 

 24- 3 

 24.0 

 22.3 

 22. 9 



21. 6 

 20. 4 

 20. 4 

 20. o 



19.9 



22. O 



14. O 



28.0 

 28.5 

 29.3 



29. o 



26. 9 



27. o 

 26. o 

 23.8 



23. o 



24. o 



24.9 



24. o 

 ISO 



Average length of anterior 

 radius — 



To 

 check. 



28.0 

 30- 5 

 33-6 

 35- 5 

 28.0 

 23-0 

 30- 5 

 26. s 

 31-3 

 23-0 

 28. o 



Inter- 

 mediate 

 growth. 



Total. 



s8.o 

 6s. s 

 66.3 



64.6 

 S8. o 

 58.0 

 59- o 

 56.3 

 SI- 3 

 SO. 5 

 43- 

 53-0 

 48.0 



58.0 



73-0 

 88.0 

 83.0 

 81. i 

 79-6 

 73-0 

 73-'' 

 69. 3 

 59-6 

 60. s 

 63. o 

 s8.o 

 S3-0 



Average estimated 

 length of fish at 

 time of forma- 

 tion of — 



Check. 



Inter- 

 mediate 

 growth. 



63.0 

 S3-0 

 58.0 

 63. o 

 SO. s 

 43- o 

 S3-0 

 45. 8 

 63. o 

 45-5 

 48.0 

 63.0 



123.0 

 lis- 5 

 118. o 

 109. 6 

 106. 3 

 106. I 

 106. o 



103. o 



104. 6 

 90. 5 

 78.0 

 93-0 

 93- o 



Four young chinooks were collected October 22, 1915, from the Little White Salmon 

 River, Wash. These were taken near the hatchery maintained by the Bureau of Fish- 

 eries, which is about a half mile above the point where the Little White Salmon enters 

 the Columbia River. These four fish are all females and average 92.5 mm. in length. 

 The average number of rings on the scales js 15.8, and the average length of the ante- 

 rior radius of the scales, 52.5. There is no indication of wider marginal rings on the 

 scales of these fish. 



