アラビア海におけるキハダの漁獲率と分布の経年および周年変化

概要

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I studied on the annual and monthly variations of fishing condition and distribution of yellowfin tuna in the Arabian Sea. 1) The rate-of-catch (catch number per hundred hooks) of the fish was high in 1955-56, and low in 1957-58 and medium in 1959. 2) The rate-of-catch of the fish was high in every spring and late of autumn. Good fishing period was from March to May in 1955-56 and May in 1957-58. 3) The rate-of-catch of each sub-area increased and decreased with all sub-areas. Good fishing area was distributed in the eastern part in 1957-58 and in the middle or in the wes-tern part of the Bay in 1955-56 and 1959. 4) Good fishing area was distributed from March to May in the mouth part and the area in the inner part extended from western part for middle in the same period in 1957-58. It has changed from the middle part for western one in the above-mentioned period in 1955, 1956 and 1959. 5) Accordingly, fishing condition and distribution in the good fishing year differ from those of the bad fishing year, and those of 1959. However, it seems that 1959 may be good fishing year in my conjecture.