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<p>Ocean salinity fluctuates due to ocean circulation changes caused by global warming and climate change. However, limited research has addressed the combined effects of light wavelengths and salinity changes on the physiological stress responses of disk abalone (<i>Haliotis discus hannai</i>). This study analyzed the stress responses of disk abalone to light-emitting diode (LED) lighting at different wavelengths under varying salinity conditions. Disk abalone were exposed to salinity conditions of 28 psu (80%) and 42 psu (120%), with 34 psu (100%) as the control group. In terms of light conditions, the control group was exposed to white fluorescent light (W, 0.5&#xa0;W/m<sup>2</sup>), while the experimental groups were subjected to red (R, 630&#xa0;nm, 0.5&#xa0;W/m<sup>2</sup>) and blue (B, 460&#xa0;nm, 0.5&#xa0;W/m<sup>2</sup>) LED lights. Moreover, we analyzed <i>Na⁺/K⁺-ATPase</i> (<i>NKA</i>) mRNA expression in the gills under salinity stress and measured osmolarity and cortisol levels in the hemolymph. Furthermore, we analyzed <i>heat shock protein 70</i> (<i>HSP70</i>) mRNA expression in the hepatopancreas to investigate stress responses. Additionally, ROS-induced apoptosis was assessed by examining <i>Caspase-7</i> mRNA expression and performing Terminal Deoxynucleotidyl Transferase dUTP Nick End Labeling (TUNEL) analysis in the hepatopancreas. The results indicated that the physiological response of disk abalone varied based on salinity and light wavelengths. The high-salinity experimental group demonstrated increased osmoregulation and stress response, especially under blue light. Conversely, red light activated osmoregulation and stress defense mechanisms under both high- and low-salinity conditions. This study highlights the influence of LED lighting on the physiological responses and stress regulation of disk abalone under varying salinity conditions, with red light demonstrating positive effects. The study provides valuable insights into the salinity stress response of disk abalone and explores the potential of red light in mitigating stress for this high-value aquaculture species in Korea.</p>

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Effects of Different Wavelengths on Stress Responses in Disk Abalone Haliotis discus hannai Exposed to Changing Saline Environments

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • Rae Hyok Hwang,
  • Jin A Kim,
  • Ji Yong Choi,
  • Jun-Hwan Kim,
  • Cheol Young Choi

摘要

Ocean salinity fluctuates due to ocean circulation changes caused by global warming and climate change. However, limited research has addressed the combined effects of light wavelengths and salinity changes on the physiological stress responses of disk abalone (Haliotis discus hannai). This study analyzed the stress responses of disk abalone to light-emitting diode (LED) lighting at different wavelengths under varying salinity conditions. Disk abalone were exposed to salinity conditions of 28 psu (80%) and 42 psu (120%), with 34 psu (100%) as the control group. In terms of light conditions, the control group was exposed to white fluorescent light (W, 0.5 W/m2), while the experimental groups were subjected to red (R, 630 nm, 0.5 W/m2) and blue (B, 460 nm, 0.5 W/m2) LED lights. Moreover, we analyzed Na⁺/K⁺-ATPase (NKA) mRNA expression in the gills under salinity stress and measured osmolarity and cortisol levels in the hemolymph. Furthermore, we analyzed heat shock protein 70 (HSP70) mRNA expression in the hepatopancreas to investigate stress responses. Additionally, ROS-induced apoptosis was assessed by examining Caspase-7 mRNA expression and performing Terminal Deoxynucleotidyl Transferase dUTP Nick End Labeling (TUNEL) analysis in the hepatopancreas. The results indicated that the physiological response of disk abalone varied based on salinity and light wavelengths. The high-salinity experimental group demonstrated increased osmoregulation and stress response, especially under blue light. Conversely, red light activated osmoregulation and stress defense mechanisms under both high- and low-salinity conditions. This study highlights the influence of LED lighting on the physiological responses and stress regulation of disk abalone under varying salinity conditions, with red light demonstrating positive effects. The study provides valuable insights into the salinity stress response of disk abalone and explores the potential of red light in mitigating stress for this high-value aquaculture species in Korea.