抄録
Immunogenetic investigations for identifying subpopulations of the North Pacific fin whales have been conducted since 1952 (Fujino, 1) 1960). Relative incidences of Ju blood types are used as genetic marker of isolated breeding population. Present paper deals with this type of further informations as well as the results of marking return on the fin whales taken from Gulf of Alaska and west coast of British Columbia in the summer seasons 1961 and 1962 that had not been involved in the previous report. The results suggest that further two different breeding subpopulations which have low incidences of Ju2-positives and marked high those respectively distribute in the Gulf of Alaska, waters off British Columbia and California. Boundary of migratory range of each population was preliminarily estimated.
