マーシャル,パルミラ諸島周辺におけるメバチの漁況経年変化の原因について-6-

概要

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Overlapping the regression curves of fork length of big-eyed tuna as against year class reported by Iverson2), Kamimura-and-Honma6), Honma-and-Kamimura7). Suda8) and Shumura9) upon the regression curves of fork length of the fish as against age reported by Suda-Tatsuki-and-Udo4) and Yukinawa-and-Yabuta5), I made a mean logistic curve of the fish from those regression curves. On basis of this mean logistic curve and the mean fork length of the fish of four years of age in April reported by Iverson2) and Shomura9), I deduced a mean fork length of the fish by age. Then assuming this to represent the mean fork length of fish of each age group, I tried to transform fork length frequency of the fish by year to age frequency by year. As result of observation of these analysis it has been presumed that appearance of a dom-inant age group had brought about subsequent annual variation of longline catch-rate and that such a dominant age group had been spawned in 1948, 1949 and 1954.
社団法人日本水産学会の論文