魚群の輸紋学的考察-予報 : 東北海区の漁獲サンマについて

概要

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Examining the graphic representations of body-length distribution by KIMURA3) for catches of saury pike, it was noticed a peculiar situation that in fishing seasons extending every year from September to December, during which the fish continues to increase in body-length, the values for the most predominant body-length characteristic of every mode of body-length distribution changes in some cases suddenly from a route to another and in other cases stepwise from a higher level to a lower (see Fig. 1). In the light of the relationship found between body-length and time of scale-ring formation or granographically assessed age of saury pike, which is now in preparation to be published, the abovementioned peculiar phenomena about body-length distribution were interpreted as a reflection of that any school of saury pike is possible to be replaced by or mingled with that of another age. As to the fishing ground where such replacing or mixing is realized, its yearly change in geographic position seems to be negligible. It may be regarded, therefore, that a school of saury pike temporarily form separate schools on the way of their migration toward the north and the south along the coast of Japan proper.
公益社団法人日本水産学会の論文