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<p>The growth of abalone aquaculture necessitates a consistent supply of seaweed resources and biofouling macroalgae have been identified as a potential supplementary component in aquafeed formulation. In this study, the effects of replacing <i>Undaria pinnatifida</i> with <i>Ulva australis</i> and <i>Sargassum horneri</i> in the diet of abalone (<i>Haliotis discus hannai</i>) were evaluated. The dietary treatments—Con (containing <i>U. pinnatifida</i>), Diet 1 (100% replacement with <i>U. australis</i>), and Diet 2 (100% replacement with 1:1 mixture of <i>U. australis</i> and <i>S. horneri</i>)—were fed to the abalone (0.43 ± 0.09&#xa0;g, 15.37&#xa0;mm) for 6&#xa0;months. Growth performance was statistically the highest in Diet 2, followed by Diet 1 and Con groups (<i>p</i> &lt; <i>0.05</i>). The expression of insulin signaling pathway genes (AIP2, IR, PI3K, AKT, mTOR, and S6K) and muscle structural genes (MHC and Col1α) were upregulated in Diet 2 compared to the Con-fed abalone (<i>p</i> &lt; <i>0.05</i>). Likewise, the concentration of α-amylase, intestinal villi height and expression of immune genes (NF-κB and TNF-α) was the highest in Diet 2 (<i>p</i> &lt; <i>0.05</i>). Collagen content and hardness in the muscle was the highest in the Diet-2 fed-abalone (<i>p</i> &lt; 0.05). Sensory evaluation revealed comparable taste profile and is irrespective of the diets given. These findings illustrate that the biofouling macroalgae can effectively utilized as <i>U. pinnatifida</i> replacement in the feed formulation for abalone, contributing to improved growth, stronger immunity and consistent meat sensory attributes.</p>

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Evaluation of Ulva australis, singly or combined with Sargassum horneri, as a replacement for Undaria pinnatifida in abalone (Haliotis discus hannai): effects on growth, insulin signaling pathway, digestion, immune function, and meat sensory characteristics

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Chae-Hee Lee,
  • Josel Cadangin,
  • Bo-Hyun Joo,
  • Eun-Seo Lee,
  • Ji-Sung Moon,
  • Sang-Woo Hur,
  • Byung Hwa Min,
  • Taek-Jeong Nam,
  • Youn Hee Choi

摘要

The growth of abalone aquaculture necessitates a consistent supply of seaweed resources and biofouling macroalgae have been identified as a potential supplementary component in aquafeed formulation. In this study, the effects of replacing Undaria pinnatifida with Ulva australis and Sargassum horneri in the diet of abalone (Haliotis discus hannai) were evaluated. The dietary treatments—Con (containing U. pinnatifida), Diet 1 (100% replacement with U. australis), and Diet 2 (100% replacement with 1:1 mixture of U. australis and S. horneri)—were fed to the abalone (0.43 ± 0.09 g, 15.37 mm) for 6 months. Growth performance was statistically the highest in Diet 2, followed by Diet 1 and Con groups (p < 0.05). The expression of insulin signaling pathway genes (AIP2, IR, PI3K, AKT, mTOR, and S6K) and muscle structural genes (MHC and Col1α) were upregulated in Diet 2 compared to the Con-fed abalone (p < 0.05). Likewise, the concentration of α-amylase, intestinal villi height and expression of immune genes (NF-κB and TNF-α) was the highest in Diet 2 (p < 0.05). Collagen content and hardness in the muscle was the highest in the Diet-2 fed-abalone (p < 0.05). Sensory evaluation revealed comparable taste profile and is irrespective of the diets given. These findings illustrate that the biofouling macroalgae can effectively utilized as U. pinnatifida replacement in the feed formulation for abalone, contributing to improved growth, stronger immunity and consistent meat sensory attributes.