On the Rings Appearing on the Otolith of one Form of the Japanese Mackerels

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  • サバの耳石に顯われる輸紋に就いて
  • サバ ノ ジセキ ニ ケンワレル リンモン ニ ツイテ

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Abstract

The rings of otolith were examined in age determination of the one form of the Japanese makerels, Scomber japonicus japonicus (HOUTTUYN), because the scales are almost completely rubbed off prior to the collecting of the fish.<br> 1) The percents of the otoliths which show opaque or translucent margin for each month of the year are shown in table 2.<br> 2) The relation between the fork length and otolith length is given by F.L=17.7R-9.1 (when F.L is fork length in cm, R is distan ?? between the center of otolith and its anterior margin in mm)<br> 3) The range and average of the fork length of each age group and the calculated fork length are shown in tables 3 and 4.

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