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Abstract <p>The effect of food deprivation (30 days) and subsequent refeeding on triiodothyronine content, locomotor activity, and aggregation in yearlings of the European bitterling <i>Rhodeus amarus</i> was studied<i>.</i> Food-deprived bitterlings displayed a decline in triiodothyronine content during the first ten days, followed by a steady increase that continued until refeeding. From the third to fifth days of food deprivation, the locomotor activity of food-deprived fish increased significantly compared to that of the regularly fed control fish. Food-deprived bitterlings demonstrated a significantly lower degree of aggregation than the control group. They also expanded the exploratory area and utilized all water layers, while the control fish preferred to move close to the bottom. These findings suggest that prolonged food deprivation modulates thyroid status and triggers a behavioral shift, i.e. induces a multidirectional migration. Upon refeeding, behavioral characteristics (locomotor activity and aggregation degree) recovered faster than hormonal content.</p>

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Effect of Food Deprivation on Triiodothyronine Level and Locomotor Activity of the European Bitterling Rhodeus amarus (Acheilognathidae)

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  • 出版模式：

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  • 发表日期：

    2026年6月23日

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  • D. S. Pavlov,
  • V. V. Kostin,
  • V. Yu. Parshina,
  • V. M. Slivko,
  • F. N. Shkil

摘要

Abstract

The effect of food deprivation (30 days) and subsequent refeeding on triiodothyronine content, locomotor activity, and aggregation in yearlings of the European bitterling Rhodeus amarus was studied. Food-deprived bitterlings displayed a decline in triiodothyronine content during the first ten days, followed by a steady increase that continued until refeeding. From the third to fifth days of food deprivation, the locomotor activity of food-deprived fish increased significantly compared to that of the regularly fed control fish. Food-deprived bitterlings demonstrated a significantly lower degree of aggregation than the control group. They also expanded the exploratory area and utilized all water layers, while the control fish preferred to move close to the bottom. These findings suggest that prolonged food deprivation modulates thyroid status and triggers a behavioral shift, i.e. induces a multidirectional migration. Upon refeeding, behavioral characteristics (locomotor activity and aggregation degree) recovered faster than hormonal content.