本邦產アマダイ属魚類に關する硏究(第1報) : アカアマダイとキアマダイとの識別について

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  • Studies on "amadai"(Gen. Branchiostegus) of Japan. I.Discrimination between "aka-amadai" and "ki-amadai".
  • 本邦産アマダイ属魚類に関する研究-1 : アカアマダイとキアマダイとの識別について

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The author consulted the discriminating standards in the previous references, chiefly about external characters of the "amadai" of Japan. Color is variable and serration on the posterior margin of preopercle is rerative, therefore the species cannot be distinguishable by these characters. Firstly, a pearl-white spot in the form of an inverted triangle close to the postero-inferior angle of the eye is in "aka-amadai", while a stripe of the same color from the antero-inferior angle of the eye obliquely downwards and forewards in "kiamadai" (TANAKA, 1931).4) Secondarily, vivid yellow stripes are on the upper half of caudal fin in the former while some numbers of spots of similar color are noticeable on the lower half in the latter. These are very distinct and stable characters. Other characters which appear to occur are as follows: (1) Upper portion above the angle on the border-line between head-bones and preopercle is concave in the former, while nearly straight in the latter. (2) The caudal fin of the latter is darker in color than that of the former. (3) In the posterior margin of lower half of the caudal fin, concavity is more conspicuous in the latter than in the former. (4) Upper and lower lobes of the caudal fin are subequal in fength in the latter, while in the former the lower lobe is shorter than the upper one.

長崎大学水産学部研究報告, v.1, pp.14-17; 1953

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