38 BULLETIN OF^ THE BUREAU OF FISHERIES. 



Tabls 37. — Data for 95 Young Chinooks from McCloud River, Baird, Calif., Sept. 18, 1911. 



Length. 



Number. 



Scale record. 



Average 



number of 



rings. 



Average 

 length of 

 anterior 

 radius. 



Z06 to no mm.. 

 loi to 105 mm. . 

 96 to 100 mm.. . 



91 to 95 mm 



86 to 90 mm. . . . 



81 to 85 mm 



76 to 80 mm 



Av. 93.2 mm. 



13.6 



6t.o 

 Si-7 

 49- S 

 4S-4 

 42.6 

 36.8 

 38.0 



46.6 



The next collection was made October i8, 191 1. One hundred and forty-six 

 specimens were taken. Two of these are mature males 97 and 106 mm. in length. 

 Their scales have an average of 15 rings, and the average length of the anterior radius 

 is 53.2. One of the immature fish had started the new growth, as is indicated by two 

 wider marginal rings. This specimen is no mm. long, and the scales have 15 rings 

 belonging to the first year's growth. The length of the anterior radius is 36 to the end 

 of the first year's growth and 45 to the periphery of the scales. Sixty-two males aver- 

 age 99.8 mm. and 81 females 98.9 mm. in length. The data for the immature fish 

 which had not begun the new growth are given in the following table (38) : 



Table 38. — Data for 143 Young Chinooks from McCloud River, Baird, Calif., Oct. 18, 1911. 



specimens without new growth. 



Length. 



Scale record. 



Average 



number of 



rings. 



Average 

 length of 

 anterior 

 radius. 



Ill to 115 mm. 

 106 to no mm. 

 loi to 10s nu n. 

 96 to 100 mm . 



91 to 95 mm.. . 

 86 to 9oxmn 



Av. 99.2 mm . 



17-5 

 iS-3 

 IS- I 

 14.5 

 14.0 

 13. 7 



14.7 



58.0 

 50.5 

 49. 3 

 46. 2 

 44.6 

 40. 2 



One hundred and thirty-six specimens were collected November 18, 1911. Six of 

 these are mature males which average no.5 mm. in length and whose scales have 

 an average of 15.2 rings. The average length of the anterior radius of the scales is 

 53.2. Thirty-six of the remaining 130 specimens had begun the new growth of the 

 second year. The scales of the other 94 individuals show marginal rings of the winter 

 type. The collection contains 53 males and 77 females. The average lengths of the 

 two sexes are the same, 101.2 mm. The table (39) follows: 



