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I estimated abundance of several age groups of yellowfin tuna exploited in the Tropical Western Pacific Ocean during 1952 through 1960 on the basis of the hooking-rate and the age composition of the fish. It was found that the increase of hooking-rate in the three successive periods corresponds to occurrence of three dominant year classes as follows. ??

RELATION BETWEEN ANNUAL VARIATIONS OF HOOKING-RATE AND AGE GROUPS OF YELLOWFIN TUNA IN THE TROPICAL WESTERN PACIFIC OCEAN-I