西部太平洋赤道付近におけるキハダの釣獲率経年変化と年令群経年変化との関係-I

Abstract

I studied on the annual variation of hooking-rate of yellowfin tuna in the Tropical Western Pacific Ocean. From the study it has become apparent to me that the hooking-rate was high in the past three periods (1) from September 1952 to August 1953, (2) from September 1956 to August 1957, and (3) from September 1959 to August 1960.