BLUEBACK SALMON 



OiKorhyBchus nerka 



AGE AND LENGTH 



AT SEAWARD MIGRATION 



PAST BONNEVILLE DAM 



Marine Biological Laboratory 



LIBRARY 



OECi'^~ Ibbb 

 WOODS HOLE, MASS. 



SPECIAL SCIENTIFIC REPORT- FISHERIES No. 185 



UNITED STATES DEPARTMENT OF THE INTERIOR 

 FISH AND WILDLIFE SERVICE 



