Histological Observation on the Hypothalamo-Hypophyseal System and the Thyroid Gland of the Sailfish, <I>Istiophorus platypterus</I>

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The hypothalamo-hypophyseal system and the thyroid gland of the adult and immature sailfish caught off Sado Island in the Sea of Japan were studied histologically.Seven types of glandular cells were distinguishable in the adenohypophysis.The thyrotroph of immature fish was distinct and the thyroid gland showed a hyperactive state.Due to postspawning a large number of gonadotrophs in the adult fish were found in the process of vacuolization and degranulation.A considerable amount of aldehyde fuchsin stainable neurosecretory material was laden in the cells of the nucleus preopticus, axonal tract and pars nervosa.The nucleus lateralis tuberis consisted mainly of two portions, the pars lateralis and pars ventromedialis.The cells of the pars ventromedialis in the adult fish were characterized by the presence of a large vesicular structure filled with acidophil coarse granules.
日本魚類学会の論文