ハゼ科魚類の一生における器官組織の変化-III. : シロウオの造血器官

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In order to know the possible roles of several hemopoietic organs of the ice-goby, histological changes throughout the life-span of the fish were pursued light microscopically with special relation to the sexual maturity and the postspawning death of the fish. The thymus of the larval fish, ovoid in shape, is a lymphoepithelial organ and is occupied with a number of thymic cells. But, the involution of the gland begins in the adult fish of marine life, and is evident in the fish just under the upstream migration. A remarkable atrophy of the gland is brought about in the postspawning spent fish. The immature basophil cells and lymphocytes of the spleen decrease gradually as gonads mature with simultaneous proliferation of connective tissue stroma. A pronounced diminution of the size of spleen and of the cell is found in the spent fish, in particular the female one. The hemopoietic center of the kidney, consisting of the head kidney and parenchymatous tissue of the body kidney, is packed with immature basophil cells and lymphocytes, and mitotic figures still exist at the stage of upstream migration. After that, a greater decrease in the number of these cells occurs with the degeneration of renal tubules. A significant role of the loss of hemopoiesis upon the postspawning death of the fish is postulated in relation to the loss of immunity and endocrine imbalance.
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