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<b>Abstract</b>— <p>The effect of chronic visual deprivation (eye lens removal, 3 months) on the thermopreferential behavior and preferred temperature in fish was studied for the first time on the example of the Senegal bichir <i>Polypterus senegalus</i>. In intact Senegal bichir, the range and the mean preferred temperature are 32.0–35.0 and 33.8°C, whereas in visually deprived fish they are 26.0–35.0 and 30.2°C, respectively. Compared to intact individuals, the visually deprived fish are more mobile and make 10.3 times more travels from compartment to compartment in the thermogradient tray, their total travel distance is 16.9 times longer, and the distance swum without change of direction is 1.6 times longer and takes 8.7 times less time. The rate of temperature change during movements is 14.9 times higher in visually deprived fish than in intact individuals. Changes in thermal preference and movement activity found in fish experiencing chronic visual deprivation indicate the presence of complex relations between thermoreception and the visual system.</p>

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Thermopreferential Behavior of the Senegal Bichir Polypterus senegalus (Polypteridae) under Chronic Visual Deprivation

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • A. O. Kasumyan,
  • V. V. Zdanovich,
  • V. V. Sataeva

摘要

Abstract—

The effect of chronic visual deprivation (eye lens removal, 3 months) on the thermopreferential behavior and preferred temperature in fish was studied for the first time on the example of the Senegal bichir Polypterus senegalus. In intact Senegal bichir, the range and the mean preferred temperature are 32.0–35.0 and 33.8°C, whereas in visually deprived fish they are 26.0–35.0 and 30.2°C, respectively. Compared to intact individuals, the visually deprived fish are more mobile and make 10.3 times more travels from compartment to compartment in the thermogradient tray, their total travel distance is 16.9 times longer, and the distance swum without change of direction is 1.6 times longer and takes 8.7 times less time. The rate of temperature change during movements is 14.9 times higher in visually deprived fish than in intact individuals. Changes in thermal preference and movement activity found in fish experiencing chronic visual deprivation indicate the presence of complex relations between thermoreception and the visual system.