ハゼ科魚類の一生における器官組織の変化-VI : ミミズハゼのリンパ球造血器官にみられる周年変化

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Lymphopoietic organs, such as the thymus, spleen and head kidney, of the two-year-old flat-head goby, Luciogobius guttatus, were examined histologically to elucidate the role and seasonal changes of these organs in relation to sexual maturity. The materials were collected at the gravel beaches of the Hayakawa River in the vicinity of Murakami City facing the Japan Sea throughout the year of 1972. The greatest enlargement in the parenchymatous tissue of the thymus and gonadal maturation of the present specimens occur one to two months earlier than in the specimens from Sado Island reported previously, i.e., the fish attained its spent condition by the middle of June. The cyclic pattern of the activity of the thymus was nearly identical with that of Sado Island specimens. The greatest number of small lymphocytes in the spleen, as well as in the lymphoid tissue of the head kidney, occur about one month later than in the thymus. The cyclic pattern of the changes in the size of interrenal cells is quite inverted to that of the changes in the number of small lymphocytes in the spleen and head kidney.
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