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<p><i>Crassostrea ariakensis</i> plays an important role in protecting biodiversity and improving water quality, in addition to its potential as an economically valuable species for aquaculture. Assessing environmental suitability is essential for selecting its aquaculture environment. To investigate the temperature and salinity tolerance and aquaculture potential of <i>C. ariakensis</i>, this study used <i>C. gigas</i>, a commercially valuable oyster and well-studied oyster, as a reference. Parameters such as survival rate, heart rate, oxygen consumption rate (OCR), and ammonia excretion rate (AER) were examined to elucidate the physiological responses of <i>C. ariakensis</i> under varying temperature (20–40 ℃) and salinity (2–65‰) conditions. Antioxidant enzyme activity (superoxide dismutase, catalase), lipid peroxidation, and expression of heat shock protein (HSP) genes were studied under varying temperature (18–34 ℃) and salinity (5–65‰) conditions. The temperature tolerance limit of <i>C. ariakensis</i> was approximately 30 ℃, beyond which its physiological indices and antioxidant capacity significantly decreased, similar to <i>C. gigas</i>. <i>C. ariakensis</i> exhibited better oxygen supply capacity but lower ammonia excretion rate in response to temperature stimulation. Higher expression of heat shock protein genes in <i>C. ariakensis</i> at high temperatures indicated a stronger response to high-temperature stress compared to <i>C. gigas</i>. <i>C. ariakensis</i> exhibited higher oxygen supply and metabolism than <i>C. gigas</i> at low salinity levels, but showed lower ammonia excretion rate at salinities above 35‰. The salinity resistance indicators of <i>C. ariakensis</i> were comparable to those of <i>C. gigas</i> at salinities ranging from 20‰ to 35‰. These findings suggest that while both species exhibit similar high-temperature adaptations, <i>C. ariakensis</i> shows greater resilience to lower salinities.</p>

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Comparative survival, physiological, biochemical and molecular response in two species of Crassostrea under different temperatures and salinities

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Guangzhou Liu,
  • Haikun Li,
  • Hao Peng,
  • Ruihai Yu

摘要

Crassostrea ariakensis plays an important role in protecting biodiversity and improving water quality, in addition to its potential as an economically valuable species for aquaculture. Assessing environmental suitability is essential for selecting its aquaculture environment. To investigate the temperature and salinity tolerance and aquaculture potential of C. ariakensis, this study used C. gigas, a commercially valuable oyster and well-studied oyster, as a reference. Parameters such as survival rate, heart rate, oxygen consumption rate (OCR), and ammonia excretion rate (AER) were examined to elucidate the physiological responses of C. ariakensis under varying temperature (20–40 ℃) and salinity (2–65‰) conditions. Antioxidant enzyme activity (superoxide dismutase, catalase), lipid peroxidation, and expression of heat shock protein (HSP) genes were studied under varying temperature (18–34 ℃) and salinity (5–65‰) conditions. The temperature tolerance limit of C. ariakensis was approximately 30 ℃, beyond which its physiological indices and antioxidant capacity significantly decreased, similar to C. gigas. C. ariakensis exhibited better oxygen supply capacity but lower ammonia excretion rate in response to temperature stimulation. Higher expression of heat shock protein genes in C. ariakensis at high temperatures indicated a stronger response to high-temperature stress compared to C. gigas. C. ariakensis exhibited higher oxygen supply and metabolism than C. gigas at low salinity levels, but showed lower ammonia excretion rate at salinities above 35‰. The salinity resistance indicators of C. ariakensis were comparable to those of C. gigas at salinities ranging from 20‰ to 35‰. These findings suggest that while both species exhibit similar high-temperature adaptations, C. ariakensis shows greater resilience to lower salinities.