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<p>The rhodophyte, <i>Palmaria hecatensis,</i> has gained interest as a potential aquaculture species in the Northwest Pacific region. However, rising seawater temperatures due to climate change may threaten its productivity and quality. This study aims to enhance the thermal tolerance of <i>P. hecatensis</i> by using <i>Sargassum horneri</i> extract (SHE) and nutrient enrichment. <i>Palmaria hecatensis</i> was pre-treated with SHE for ten days and then cultivated for 14 days at two temperatures (8 ℃, optimal; 18 ℃, high temperature) and three nutrient concentrations (low nutrient: 5 μM nitrate and 0.3 μM phosphate (LN); medium nutrient: 50 μM nitrate and 3 μM phosphate (MN); high nutrient: 500 μM nitrate and 30 μM phosphate (HN)). Specific growth rate (SGR), nutrient content, pigment levels, protein content, oxidative stress, and antioxidant enzyme activity were assessed. At 8 ℃, the mean SGR of non-treated and SHE pre-treated samples were 1.12 and 1.06 % day <sup>-1</sup>, respectively. At 18 ℃, non-treated samples exhibited 50% reduced SGR (0.63 % day <sup>-1</sup>), with decreased protein content due to oxidative stress. In contrast, SHE pre-treatment samples increased their antioxidant enzyme activity, mitigating oxidative stress and exhibiting similar SGR (1.05 % day <sup>-1</sup>) and protein content that those found at 8 ℃. These findings suggest that the SHE pre-treatment effectively enhanced the thermal tolerance of <i>P. hecatensis</i>.</p>

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Influence of Sargassum horneri extract (SHE) pre-treatment and nutrient availability on the thermal tolerance of Palmaria hecatensis

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • Jae Woo Jung,
  • Muriel Dittrich,
  • Schery Umanzor,
  • Jang K. Kim

摘要

The rhodophyte, Palmaria hecatensis, has gained interest as a potential aquaculture species in the Northwest Pacific region. However, rising seawater temperatures due to climate change may threaten its productivity and quality. This study aims to enhance the thermal tolerance of P. hecatensis by using Sargassum horneri extract (SHE) and nutrient enrichment. Palmaria hecatensis was pre-treated with SHE for ten days and then cultivated for 14 days at two temperatures (8 ℃, optimal; 18 ℃, high temperature) and three nutrient concentrations (low nutrient: 5 μM nitrate and 0.3 μM phosphate (LN); medium nutrient: 50 μM nitrate and 3 μM phosphate (MN); high nutrient: 500 μM nitrate and 30 μM phosphate (HN)). Specific growth rate (SGR), nutrient content, pigment levels, protein content, oxidative stress, and antioxidant enzyme activity were assessed. At 8 ℃, the mean SGR of non-treated and SHE pre-treated samples were 1.12 and 1.06 % day -1, respectively. At 18 ℃, non-treated samples exhibited 50% reduced SGR (0.63 % day -1), with decreased protein content due to oxidative stress. In contrast, SHE pre-treatment samples increased their antioxidant enzyme activity, mitigating oxidative stress and exhibiting similar SGR (1.05 % day -1) and protein content that those found at 8 ℃. These findings suggest that the SHE pre-treatment effectively enhanced the thermal tolerance of P. hecatensis.