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<p>A 4-month feeding trial was conducted in 1.5 m<sup>3</sup> floating sea cages to determine the optimum dietary protein requirement for cultured golden rabbitfish, <i>Siganus guttatus</i> fed low fishmeal-based diets. Four test diets were formulated to contain different levels of crude protein (CP) at 25, 30, 35, and 40% designated as P25, P30, P35, and P40, respectively. Golden rabbitfish (<i>n</i> = 20) with an initial body weight of 41.9 ± 0.7&#xa0;g were randomly stocked into 1 × 1 × 1.5 m<sup>3</sup> triplicate cages per dietary treatment. Fish were hand-fed three times per day to satiation. The optimum level of dietary CP to produce maximum growth of golden rabbitfish was 35.2% determined by second-order polynomial regression analysis (<i>r</i> = 0.751) for three parameters (specific growth rate, protein retention, and intestinal IGF-1 mRNA expression). Protein retention significantly increased as the protein increased up to 30% and then further decreased as dietary protein increased from 35 to 40% with the maximum value obtained at CP of 33.2% (<i>r</i> = 0.896). Fish fed the P35 diet had the highest IGF-1 mRNA expression level in the intestine, 3.6-fold from the P40 diet and 5.1-fold from the P25 diet with optimal CP was 35.1% to obtain the maximum value (<i>r</i> = 0.776). Based on techniques implemented for the three variables as mentioned above, of SGR (35.2%), PR (33.2%) and IGF-1 (35.1%), the golden rabbitfish required an optimum level of dietary CP at 34.5% when fed SBM based diets and low fishmeal.</p>

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Dietary crude protein requirement of golden rabbitfish Siganus guttatus fed low fishmeal diets with varying soybean meal: influence on growth, plasma biochemistry, amino acid profiles, and IGF-1 mRNA expression

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月5日

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  • Asda Laining,
  • Sri Redjeki Hesti Mulyaningrum,
  • Bunga Rante Tampangallo,
  • Ike Trismawanti,
  • Muhammad Chaidir Undu,
  • Alimuddin Alimuddin,
  • Igor Pirozzi

摘要

A 4-month feeding trial was conducted in 1.5 m3 floating sea cages to determine the optimum dietary protein requirement for cultured golden rabbitfish, Siganus guttatus fed low fishmeal-based diets. Four test diets were formulated to contain different levels of crude protein (CP) at 25, 30, 35, and 40% designated as P25, P30, P35, and P40, respectively. Golden rabbitfish (n = 20) with an initial body weight of 41.9 ± 0.7 g were randomly stocked into 1 × 1 × 1.5 m3 triplicate cages per dietary treatment. Fish were hand-fed three times per day to satiation. The optimum level of dietary CP to produce maximum growth of golden rabbitfish was 35.2% determined by second-order polynomial regression analysis (r = 0.751) for three parameters (specific growth rate, protein retention, and intestinal IGF-1 mRNA expression). Protein retention significantly increased as the protein increased up to 30% and then further decreased as dietary protein increased from 35 to 40% with the maximum value obtained at CP of 33.2% (r = 0.896). Fish fed the P35 diet had the highest IGF-1 mRNA expression level in the intestine, 3.6-fold from the P40 diet and 5.1-fold from the P25 diet with optimal CP was 35.1% to obtain the maximum value (r = 0.776). Based on techniques implemented for the three variables as mentioned above, of SGR (35.2%), PR (33.2%) and IGF-1 (35.1%), the golden rabbitfish required an optimum level of dietary CP at 34.5% when fed SBM based diets and low fishmeal.