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<p>A 90-day feeding trial was performed to assess the effects of substituting dietary kelp meal with <i>Sargassum hemiphyllum</i> on the growth, muscle texture, and immune of abalone (<i>Haliotis discus hannai</i>) (initial body weight: 4.23 ± 0.04&#xa0;g; initial shell length: 32.53 ± 0.19&#xa0;mm). The control diet (SHE0) was designed with a 30% kelp meal inclusion rate. Based on the control diet, <i>S. hemiphyllum</i> was added gradually at 5% (SHE5), 10% (SHE10), 15% (SHE15), 20% (SHE20), 25% (SHE25) and 30% (SHE30), respectively. The <i>S. hemiphyllum</i> and kelp accounted for 30% of the diet composition. Results showed that the survival rate, daily increment in shell length and fillet yield of abalone was not significantly different among all groups. The SHE5-SHE15 groups had no adverse effects on weight gain rate and feed conversion ratio of abalone compared with that of the SHE0 group. The height, width and muscularis propria thickness of intestinal villi all reached a maximum at the SHE15 group. Furthermore, the springiness of muscles achieved a highest value in the SHE15 group and a lowest value in the SHE25 group. No significant differences were observed in hardness and chewness among all groups. As the dietary replacement of <i>S. hemiphyllum</i> increased, there were no significant difference in the total anti-oxidative capacity level and albumin content in the cell-free hemolymph (CFH) in the range of SHE5-SHE20 groups compared with that of the SHE0 group. Highest values for both glucose content and lysozyme activity in the CFH were obtained in the SHE15 group.The inducible nitric oxide synthase activity in the CFH was lower in SHE10, SHE20 and SHE25 groups. In addition, gene expression of nuclear transcription factor κB and tumour necrosis factor α were reduced in the digestive gland of abalone in the SHE10-SHE15 groups. In conclusion, when the additive ratio of <i>S. hemiphyllum</i> to kelp was ≤ 1:1 (i.e., 15% of kelp and 15% of <i>S. hemiphyllum</i>), it had no significant effect on the growth performance of abalone, and it significantly improved the muscle texture and immune function of abalone.</p>

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Impacts of Sargassum hemiphyllum substitution for dietary kelp meal on the growth performance, muscle texture and immunity of abalone (Haliotis discus hannai)

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Ziqian Han,
  • Gaochan Qin,
  • Zhenhua Wu,
  • Xiaojun Yu,
  • Ze Zhang,
  • Tingting Fang,
  • Yongqing Liu,
  • Yang Liu,
  • Kangsen Mai,
  • Wenbing Zhang

摘要

A 90-day feeding trial was performed to assess the effects of substituting dietary kelp meal with Sargassum hemiphyllum on the growth, muscle texture, and immune of abalone (Haliotis discus hannai) (initial body weight: 4.23 ± 0.04 g; initial shell length: 32.53 ± 0.19 mm). The control diet (SHE0) was designed with a 30% kelp meal inclusion rate. Based on the control diet, S. hemiphyllum was added gradually at 5% (SHE5), 10% (SHE10), 15% (SHE15), 20% (SHE20), 25% (SHE25) and 30% (SHE30), respectively. The S. hemiphyllum and kelp accounted for 30% of the diet composition. Results showed that the survival rate, daily increment in shell length and fillet yield of abalone was not significantly different among all groups. The SHE5-SHE15 groups had no adverse effects on weight gain rate and feed conversion ratio of abalone compared with that of the SHE0 group. The height, width and muscularis propria thickness of intestinal villi all reached a maximum at the SHE15 group. Furthermore, the springiness of muscles achieved a highest value in the SHE15 group and a lowest value in the SHE25 group. No significant differences were observed in hardness and chewness among all groups. As the dietary replacement of S. hemiphyllum increased, there were no significant difference in the total anti-oxidative capacity level and albumin content in the cell-free hemolymph (CFH) in the range of SHE5-SHE20 groups compared with that of the SHE0 group. Highest values for both glucose content and lysozyme activity in the CFH were obtained in the SHE15 group.The inducible nitric oxide synthase activity in the CFH was lower in SHE10, SHE20 and SHE25 groups. In addition, gene expression of nuclear transcription factor κB and tumour necrosis factor α were reduced in the digestive gland of abalone in the SHE10-SHE15 groups. In conclusion, when the additive ratio of S. hemiphyllum to kelp was ≤ 1:1 (i.e., 15% of kelp and 15% of S. hemiphyllum), it had no significant effect on the growth performance of abalone, and it significantly improved the muscle texture and immune function of abalone.