ニジマス卵の過熱現象について-3-過熱卵魚の生理状態

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In previous papers, we reported that ovulated ova attain an overripened con-dition if retained in the body cavity for an extended period. In this report, the physiological condition of overripened females is discussed from a histological viewpoint. Females which had ovulated and were examined several days after ovulation possessed a small liver. Histologically, hepatic cells were generally atrophic and contained little glycogen and fat; some degenerative cells were also evident. Some degenerated urinary tubules were observed in the kidney. Low epithelial height and an abundance of colloidal material was thought to reflect a hypofunctional condition of the thyroid gland. In contrast, females which had been stripped about one month prior to examina-tion possessed a large liver. Hepatic cells were hypertrophic and contained consider-ably more glycogen and fat; pathological features were rare. Kidney demonstrated normal morphological features, while most thyroid follicles consisted of tall columnar epithelial cells and contained a scanty amount of colloidal material. Overall, the pathological conditions observed in ovulated females seemed to improve after stripping. Females which were still in possession of overripened ova showed very conspicuous pathological features. Degenerative changes were frequently observed in hepatic and urinary tissues. The epithelial height of thyroid follicles was low. Additionally, the interrenal gland exhibited a hyperfunctional state. It is postulated that the poor physiological condition apparent in overripened females brought on by exhaustion not only improves but also becomes more intensified after the spawning season.
日本水産學會の論文

ニジマス卵の過熱現象について-3-過熱卵魚の生理状態

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