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Abstract <p>The thermogenesis activity of erythrocyte ecto-ATPase and its influence on the body temperature was studied in demersal fish: the thornback ray <i>Raja clavata</i> Linnaeus, 1758; the black scorpionfish <i>Scorpaena porcus</i> Linnaeus, 1758; the tub gurnard <i>Chelidonichthys lucerna</i> Linnaeus, 1758; and the Black Sea turbot <i>Scophthalmus maeoticus</i> Pallas, 1814. It was shown that erythrocyte suspensions from the thornback ray and the black scorpionfish, which have high ecto-ATPase activity, demonstrated a high capacity for heat generation during ATP addition. In contrast, erythrocytes of the tub gurnard and the Black Sea turbot, having low activity of the ecto-enzyme, demonstrated lower heat production under the same conditions. Thermograms of all studied fish species had similar dynamic profiles of temperature change in the erythrocyte suspension, which was termed a thermal jump. The fish species were subdivided into two pairs according to thermogenesis activity: the thornback ray and the black scorpionfish with high ecto-ATPase activity, and the tub gurnard and the Black Sea turbot with low enzyme activity. The observable effect of thermogenesis in fish with high erythrocyte ecto-ATPase activity was a higher body temperature. Juvenile thornback rays had a body temperature higher than the environment by 0.09°C, and mature individuals by 0.18°C. This difference is attributed to the lower heat loss of adult fish, which have a higher body mass compared to juveniles. The increase in body temperature was greater in the black scorpionfish than in the thornback ray juveniles, despite their similar body masses. This can be explained by the higher ecto-ATPase activity in scorpionfish and the lower rate of heat loss due to better thermal insulation resulting from a thick muscular “framework”. Erythrocytes with high ecto-ATPase activity are effective heat “generators” capable of maintaining a higher temperature in the blood flow, which is necessary for plasma membrane function and the overall bloodstream.</p>

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Extracellular Thermogenesis Activity of Erythrocyte Ecto-ATPase and Its Influence on Body Temperature in Black Sea Demersal Fish

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Yu. A. Silkin,
  • M. Yu. Silkin,
  • E. N. Silkina

摘要

Abstract

The thermogenesis activity of erythrocyte ecto-ATPase and its influence on the body temperature was studied in demersal fish: the thornback ray Raja clavata Linnaeus, 1758; the black scorpionfish Scorpaena porcus Linnaeus, 1758; the tub gurnard Chelidonichthys lucerna Linnaeus, 1758; and the Black Sea turbot Scophthalmus maeoticus Pallas, 1814. It was shown that erythrocyte suspensions from the thornback ray and the black scorpionfish, which have high ecto-ATPase activity, demonstrated a high capacity for heat generation during ATP addition. In contrast, erythrocytes of the tub gurnard and the Black Sea turbot, having low activity of the ecto-enzyme, demonstrated lower heat production under the same conditions. Thermograms of all studied fish species had similar dynamic profiles of temperature change in the erythrocyte suspension, which was termed a thermal jump. The fish species were subdivided into two pairs according to thermogenesis activity: the thornback ray and the black scorpionfish with high ecto-ATPase activity, and the tub gurnard and the Black Sea turbot with low enzyme activity. The observable effect of thermogenesis in fish with high erythrocyte ecto-ATPase activity was a higher body temperature. Juvenile thornback rays had a body temperature higher than the environment by 0.09°C, and mature individuals by 0.18°C. This difference is attributed to the lower heat loss of adult fish, which have a higher body mass compared to juveniles. The increase in body temperature was greater in the black scorpionfish than in the thornback ray juveniles, despite their similar body masses. This can be explained by the higher ecto-ATPase activity in scorpionfish and the lower rate of heat loss due to better thermal insulation resulting from a thick muscular “framework”. Erythrocytes with high ecto-ATPase activity are effective heat “generators” capable of maintaining a higher temperature in the blood flow, which is necessary for plasma membrane function and the overall bloodstream.