Study on Age Characters of the Mud Skipper <i>Boleophthalmus chinensis</i>

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  • ムツゴロウの資源生物学的研究　Ｉ　　ムツゴロウの年齢形質
  • ムツゴロウ ノ ネンレイ ケイシツ ムツゴロウ ノ シゲン セイブツガクテキ

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The mud skipper Boleophthalmus chinensisi is an amphibious fish. In Japan, its distribution is limited only to the inner part of the Ariake Sea and a part of Yatsushiro Bay.<br> The present study was aimed at selecting the most suitable age character for age determina-tion of this species from among the pectoral radials, coracoid, pelvic girdle, scale, otolith, and vertebrae.<br> The marks of the pectoral radials, coracoid, and pelvic girdle were prominent enough to make age determination, while those of the scale, otolith, and vertebrae were obscure. Among the former three characters, the center of mark-forming (focus) was observable most clearly in the size and pectoral radials, particularly in the 2nd one.<br> All eight pectoral radials from same individual showed good correlation between their mark-size and their radial-size.<br> The relationship between the 2nd pectoral radial-size (R: mm) and the total length (TL: mm) was expressed by the following equation;<br> R=0.023 TL-0.135 r=0.987.<br> Therefore, the 2nd pectoral radial was the most suitable age character of the mud skipper.

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