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<p>This article presents a&#xa0;summary of a&#xa0;multi-year research project focused on the temperature acclimatization of salmonids. The study was conducted on two important aquaculture species, the rainbow trout and the brook trout. Additionally, the brown trout was also included. Growth, oxygen consumption, energy reserves, blood composition, and excretions of the fish were examined at an acclimatization temperature of 10°C and at 20 °C. With a&#xa0;slow increase in temperature and under optimal rearing conditions, all examined species were able to adapt to temperatures of 20 °C in the long term. The “normal” diploid brook char showed the highest adaptation potential, followed by the rainbow trout and the brown trout. Triploid brook trout exhibited the least adaptive responses. The most significant adaptation processes to increased water temperatures involve the metabolic rate and the size of red blood cells, which determine the capacity for oxygen uptake and carbon dioxide release. All adaptation mechanisms are long-term processes, as the fish require several weeks to adjust to the changed temperature conditions. During the acclimatization phase to elevated water temperatures, the fish have a&#xa0;very high energy demand, leading to a&#xa0;significant depletion of energy reserves. The loss of energy reserves makes the fish particularly sensitive to additional stress factors, which is considered as a&#xa0;limiting factor.</p>

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Anpassungsmechanismen von Salmoniden an erhöhte Wassertemperaturen

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • Franz Lahnsteiner

摘要

This article presents a summary of a multi-year research project focused on the temperature acclimatization of salmonids. The study was conducted on two important aquaculture species, the rainbow trout and the brook trout. Additionally, the brown trout was also included. Growth, oxygen consumption, energy reserves, blood composition, and excretions of the fish were examined at an acclimatization temperature of 10°C and at 20 °C. With a slow increase in temperature and under optimal rearing conditions, all examined species were able to adapt to temperatures of 20 °C in the long term. The “normal” diploid brook char showed the highest adaptation potential, followed by the rainbow trout and the brown trout. Triploid brook trout exhibited the least adaptive responses. The most significant adaptation processes to increased water temperatures involve the metabolic rate and the size of red blood cells, which determine the capacity for oxygen uptake and carbon dioxide release. All adaptation mechanisms are long-term processes, as the fish require several weeks to adjust to the changed temperature conditions. During the acclimatization phase to elevated water temperatures, the fish have a very high energy demand, leading to a significant depletion of energy reserves. The loss of energy reserves makes the fish particularly sensitive to additional stress factors, which is considered as a limiting factor.