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<p>Light condition is an environmental factor that regulates various biological processes such as growth and metabolism. However, the effects of specific light wavelengths on the reproductive processes in gastropods remain poorly understood. We evaluated the influence of different light wavelengths on the reproductive maturation in abalone (<i>Haliotis</i> <i>discus</i> <i>hannai</i>) to improve aquaculture breeding conditions. Abalones were subjected to fluorescent white light, red light (630&#xa0;nm), or green light (520&#xa0;nm) for 8&#xa0;weeks. Reproductive maturation was assessed by measuring the mRNA expression of the maturation-related genes vitellogenin (VTG), gonadotropin-releasing hormone receptors, and serotonin receptors in the gonads and retinas using quantitative PCR (qPCR) at 0, 2, 4, 6, and 8&#xa0;weeks. In addition, in situ hybridization was used to visualize VTG mRNA signals in gonadal tissues. An overall increase in gene expression was observed over time across all groups. Abalone exposed to red light showed significantly higher expression levels of all three genes than those under white or green light, especially at week 8. At week 8, in situ hybridization showed that the red light group had greater VTG signals than the green and white light groups, which was in line with the qPCR findings. These findings suggest that red light promotes the activation of reproductive genes and enhances gonadal maturation in abalone. Red light may simulate favorable environmental conditions of the natural habitats of abalone, particularly in shallow coastal areas. This study provides an effective, non-invasive strategy to improve reproductive efficiency in abalone aquaculture.</p>

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Effects of Various Light-Emitting Diode Wavelengths on the Regulation and Control of Sexual Maturation in Abalone Haliotis discus hannai

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Kun Woo Kim,
  • Won Chae Jeong,
  • Jin A. Kim,
  • Ji Yong Choi,
  • Jun-Hwan Kim,
  • Cheol Young Choi

摘要

Light condition is an environmental factor that regulates various biological processes such as growth and metabolism. However, the effects of specific light wavelengths on the reproductive processes in gastropods remain poorly understood. We evaluated the influence of different light wavelengths on the reproductive maturation in abalone (Haliotis discus hannai) to improve aquaculture breeding conditions. Abalones were subjected to fluorescent white light, red light (630 nm), or green light (520 nm) for 8 weeks. Reproductive maturation was assessed by measuring the mRNA expression of the maturation-related genes vitellogenin (VTG), gonadotropin-releasing hormone receptors, and serotonin receptors in the gonads and retinas using quantitative PCR (qPCR) at 0, 2, 4, 6, and 8 weeks. In addition, in situ hybridization was used to visualize VTG mRNA signals in gonadal tissues. An overall increase in gene expression was observed over time across all groups. Abalone exposed to red light showed significantly higher expression levels of all three genes than those under white or green light, especially at week 8. At week 8, in situ hybridization showed that the red light group had greater VTG signals than the green and white light groups, which was in line with the qPCR findings. These findings suggest that red light promotes the activation of reproductive genes and enhances gonadal maturation in abalone. Red light may simulate favorable environmental conditions of the natural habitats of abalone, particularly in shallow coastal areas. This study provides an effective, non-invasive strategy to improve reproductive efficiency in abalone aquaculture.