鱗の輪紋の研究-IV : 種族の系統判別への利用

概要

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As a first verification of the surmized duality of saury pike stock in Japanese waters, a few results of granographical rearrangement of existing data are presented in the following respects: 1. From HATANAKAs1) data a conclusion was drawn that saury pike forms two scale rings every year, in February and in September each. 2. By estimating the body-length to be reached at the time of scale-ring formation from those measured for saury pike caught in a best season, May (from the Japan Sea), and in October (from the Pacific), respectively, and putting down these two kinds of values for body-length together in a graph constructed with existing data of monthly body-length of saury pike7), a conclusion was arrived at that two different sequences of growth-curves should be assigned to the catches from the Japan Sea and those from the Pacific, respectively (Fig. 4). The duality in stock indicated by this conclusion may be supported by the granographical suggestion of two groups of saury pike, one hatched in a season extending from late spring to summer and the other from late autumn to winter. 3. The duality of saury pike stock were also pointed to about the grains on scale reported by HOTTA2), those on otolith, monthly change of the relationship between body-length and body-weight and the local and seasonal variations in distribution for egg and fry.
公益社団法人日本水産学会の論文