ハゼ科魚類の一生における器官組織の変化-VIII : ドロメ,アゴハゼ,マハゼおよびアシシロハゼの胸腺にみられる周年変化

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In order to determine the specific factor which provokes the seasonal changes in the thymic activities of gobies four selected species were examined histologically throughout their life-span. Peak thymic enlargement in all species examined is seen in May to July, whereas the breeding season of these species takes place in early spring or summer. The cyclic patterns in the thymic activities of gobiid fishes may coincide with the annual fluctuation in the duration of day light rather than with cyclic changes in breeding. The greatest relative growth of the thymus occurs in the larval or under-yearling gobies. After larval stage a gradual involution of the thymus occurs day by day. This change differs from that of adult fish which show cyclic variation. In Chasmichthys gulosus and Acanthogobius flavimanus the hyperplasia of the parenchyma and increase in the amount of connective tissue and epithelial cells take place in parallel with the enlargement of thymus. Hassalls corpuscles and their allied structures, and formation of follicles are demonstrated in the enlarged thymus.
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