36 BULLETIN OF THE BUREAU OP FISHERIES. 



Table 3$. — Data por 29 Young Chinooks prom McCixdud River, Baird, Caup., July 24 and 25, igog. 



Length. 



Number. 



Scale record. 



Average 



number of 



rings. 



Average 

 length (A 

 anterior 

 radius. 



xzi to IIS mm . 

 xo6to no mm ., 

 loi to 105 m m ., 

 96 to 100 mm.. . 



91 to 95 mm 



86 to 90 mm 



8z toSs mm 



76 to 80 mm 



71 to 75 mm 



Av. 88.5 mm. 



IS.O 

 14.0 

 14.0 

 13-3 



13. O 



"•3 

 10.4 

 9-3 

 9-5 



II. 5 



49.0 

 SS-O 

 55- o 

 SI.I 

 46.6 

 43-7 

 36.0 

 36.0 

 36.3 



43-1 



A collection consisting of 82 specimens was made September 24, 1909. Seven of 

 these are precociously mature males, averaging 109.5 mni- in length. The scales of 

 one has a band of two wider rings at the margins. This undoubtedFy represents the 

 beginning of the new growth of the second year, since, as is presently shown, over one- 

 half of the immature fish taken at this time have the new growth well developed. The 

 average number of rings included within the first year's growth (extending to the periph- 

 ery of the scales of all but the one specimen which shows new growth) is 15.3. The 

 average length of the anterior radius is 43. 



Seventy-five of the specimens included in this collection are immature fish, aver- 

 aging 96.9 mm. in length. Forty individuals have definitely begun the new growth of 

 the second year, as is indicated by a marginal band of wider rings. The scales of the 

 remaining 35 individuals have marginal bands of the narrow, winter type. Thirty-two 

 specimens are males averaging 97.9 mm. in length. Forty-three females average 

 96.3 mm. The data are presented in the following table (36) : 



Table 36. — Young Chinooks from McCloud River, Baird, Calif., Sept. 24, 1909. 

 thirty-five specimens without new growth. 



xai to i3smm. . 

 xi6to 1 30 mm.. 

 Ill to iismm. . 

 106 to 1 10 mm . . 

 loi to 105 mm. . 

 96 to 100 mm. . . 

 91 to 95 mm. . . . 



86 to 90 mm 



8r to 85 mm 



76 to 80 mm 



7X to 75 xixm — 



At. 94.01am. 



Length. 



Number. 



Scale record. 



Average 



ntmiber of 



rings. 



18.0 



17-5 

 16.7 

 17.0 

 14-3 

 13- 9 

 13-2 

 13-5 



II. o 



Average 

 length of 

 anterior 

 radius. 



69.6 



58.0 



49. S 



5».3 

 47-5 

 41. J 



40.8 

 42.3 



3'.» 

 46.0 



