SEAWARD MIGRATION OF CHINOOK SALMON. 



39 



Table 39. — Young Chinooks from McCloud River, Baird, Calif., Nov. 18, 1911. 

 ninety-four specimens without new growth. 



THIRTY-SIX SPECIMENS WITH NEW GROWTH. 



Length. 



Scale record. 



Average number of 

 rings— 



To new 

 growth. 



Of new 

 growth. 



Average length of 

 anterior radius — 



To new 

 growth. 



ToUl. 



Average 



estimated 



length of 



fish at 



time of 



beginning 



new 



growth. 



Ill to IIS mm. 

 106 to 1 10 mm. 

 loi to los mm. 

 96 to icx} mm . . 

 91 to 9s mm. . . 

 86 to 90 mm. .. 



Av. 100. 5 mm. 



14. 6 

 13-4 

 13-4 

 13-0 

 12. o 



4. o 

 1.8 

 l.g 

 X.8 



49.0 

 50. o 

 4S-4 

 41.4 

 3S-7 

 32. 2 



59- o 

 58.0 

 SI- 2 

 SI. 4 

 43-7 

 43-0 



92- S 

 9a I 

 83.0 

 80.0 

 73- o 



13-7 



43- I 



SI- 8 



85.9 



A collection made December 18, 191 6, contains 92 specimens. Only one is a 

 mature male, 108 mm. long. The scales of this individual show 16 rings, and the length 

 of the anterior radius is 59.8. Fifty-one (56 per cent) of the 91 immature specimens had 

 begun the rapid growth of the new year. The average length is 101.2 mm. Forty-five 

 males average 101.9 mm. j.nd 46 females 100.6 mm. The table (40) follows: 



Table 40. — Young Chinooks from McCloud River, Baird, C.\lif., Dec. 18, 1911. 

 forty specimens without new growth. 



Length. 



Number. 



Scale record. 



Average 



number of 



rings. 



Average 

 length of 

 anterior 

 radius. 



116 to 120 mm.. 

 Ill to iismm.. 

 106 to 110 mm., 

 101 to 105 mm., 

 96 to 100 mm... 



91 to 95 mm 



86 to 90 mm 



Av. 100.5 mm. 



i8.o 

 17. o 

 16-5 

 tS-3 

 14.8 

 15- I 

 13-0 



IS- 3 



SS-o 

 49.0 

 SJ.4 

 SO- o 

 46.3 

 46-5 

 38.0 



48- S 



