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<p>The effects of live microalgal diets on survival, growth, proximate, fatty acid and amino acid composition were investigated in the edible oyster <i>Crassostrea belcheri</i> under laboratory conditions for five weeks. In this study, four different feeding regimes were tested for <i>C. belcheri</i> spat: unfed (Control), two monospecific diets <i>Chaetoceros gracilis</i> (T1) and <i>Tetraselmis chuii</i>, (T2), and one mixed diet composed of <i>C. gracilis</i> and <i>T. chuii</i> (T3). It is hypothesized that mixed microalgal diets enhance oyster growth, and biochemical quality compared to monospecific or unfed treatments, owing to a broader and complementary nutritional profile. The oyster group fed the mixed algal diet (T3) showed a significantly greater survival rate in comparison with the other groups (<i>p</i> &lt; 0.05). Additionally, the T1 diet resulted in the highest protein, (41.7 ± 0.38) in oysters whereas, the highest lipid (20.7 ± 0.33) and carbohydrate (34.2 ± 0.33) contents were found with the T3 diet. In addition, the T3 diet substantially enhanced the energy content (23.4 ± 0.24&#xa0;MJ&#xa0;kg<sup>−1</sup>) in oyster meat compared to the other diets. The fatty acid content of oysters was increased significantly when mixed algae was fed (p &lt; 0.05). In contrast, the amino acid content of oysters was highest with the T1 diet. In this study, the mixed algal diet resulted in improved survival, growth, proximate, essential fatty acid and essential amino acid accumulation in oysters. The findings demonstrated that indoor cultivation system with mixed microalgal diet might be a potential farming technology for the production of nutritionally enriched edible oysters.</p>

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Comparative impacts of mono- and mixed microalgal diets on growth, survival, and nutritional composition of the edible oyster (Crassostrea belcheri)

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Mahima Ranjan Acharjee,
  • Subeda Newase,
  • Mohammad Ekramul Haque,
  • Trina Das,
  • Sifatun Nur,
  • Sadia Afrin,
  • Zahidul Islam,
  • S. M. Rashadul Islam,
  • Tashrif Mahmud Minhaz,
  • Helena Khatoon

摘要

The effects of live microalgal diets on survival, growth, proximate, fatty acid and amino acid composition were investigated in the edible oyster Crassostrea belcheri under laboratory conditions for five weeks. In this study, four different feeding regimes were tested for C. belcheri spat: unfed (Control), two monospecific diets Chaetoceros gracilis (T1) and Tetraselmis chuii, (T2), and one mixed diet composed of C. gracilis and T. chuii (T3). It is hypothesized that mixed microalgal diets enhance oyster growth, and biochemical quality compared to monospecific or unfed treatments, owing to a broader and complementary nutritional profile. The oyster group fed the mixed algal diet (T3) showed a significantly greater survival rate in comparison with the other groups (p < 0.05). Additionally, the T1 diet resulted in the highest protein, (41.7 ± 0.38) in oysters whereas, the highest lipid (20.7 ± 0.33) and carbohydrate (34.2 ± 0.33) contents were found with the T3 diet. In addition, the T3 diet substantially enhanced the energy content (23.4 ± 0.24 MJ kg−1) in oyster meat compared to the other diets. The fatty acid content of oysters was increased significantly when mixed algae was fed (p < 0.05). In contrast, the amino acid content of oysters was highest with the T1 diet. In this study, the mixed algal diet resulted in improved survival, growth, proximate, essential fatty acid and essential amino acid accumulation in oysters. The findings demonstrated that indoor cultivation system with mixed microalgal diet might be a potential farming technology for the production of nutritionally enriched edible oysters.