ブリ属(Seriola)の甲状腺について

概要

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In this report the writer described on the thyroid gland of two related species of Seriola. 1. The thyroid gland of Seriola. which consisted of a anterior lobe and a posterior lobe, lies on the dorsal cephalic end of the ventral aorta, and extends on the bifurcated region of the 1st and the 2nd afferent branchial arteries. In the fresh materials the coloration of this gland is brownish orange, and these soft masses can be removed easily free from the surrounding tissues and organs. 2. Ratio of fresh wet weight of the thyroid of S. quinqueradiata/1kg. of body weight is 22.73mg. and also S. aureovittata is 34.70mg. There is no remarkable unbalance between the weight of the an ?? erior lobe and the posterior lobe, as ?? een in the tuna thyroid. 3. In the histology of the Seriola thyroid the size and the form of the follicles varies a great deal. There preparations showed similarity to the thyroid of lower teleosts. In general the major follicles showed a figure of mildly or inactivity with flatte ?? ed epithelium and dense colloid. On the contrary, the follicles found in the peripheral region of the thyroid revealed a figure of active condition with columnar epthelium and granulated colloid. These histological preparations may be in restored stage after broeding.
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