'40 60 80 



100 120 140 160 180 200 220 240 260 280 300 320 340 

 Length in Millimeters 







120 



100 



80 



60 



40 



20 



_i L. 



1952 



J I I I r ?i\^^f\ ■ /\/\.,^AAAWK^ A. ■ 



J A_ 



40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 



Length in Millimeters 



120 - 



100 - 



i< 80 





60 



40 - 



20 



-I f- ^f-^-r-.'^ 



1953 



/"W^^^ ' d^__Ll^^li/=>l_£kJC!uCI>£>. 



' ^1 I I I l_ 



40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 



Length in Millimeters 



Figure 12. - Length frequency of downstream -migrant bluebacks caught at 

 Bonneville Dam, 1951-53. 



20 



