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<p>This study aimed to assess the effects of <i>Isochrysis galbana</i>, <i>Streptotheca thamesis</i>, and <i>Chaetoceros gracilis</i> as diets in the rearing of juvenile <i>Ruditapes philippinarum</i>. We evaluated the effects of these microalgae and their mixed diet on the feeding efficiency, growth, nutritional metabolism, and digestive enzyme activity of juvenile <i>R. philippinarum</i> through feeding trials, growth performance analysis, and biochemical assays. Different microalgal diets significantly influenced the feeding efficiency of juvenile clams. The highest filtration rate was observed in the <i>C.</i> <i>gracilis</i> group (<i>p</i> &lt; 0.05), and all groups had survival rates above 97%. The weight gain rate (WGR) was highest in the <i>C.</i> <i>gracilis</i> group, followed by the mixed diet group (<i>p</i> &lt; 0.05). Proximate composition analysis revealed that the <i>I.</i> <i>galbana</i> group showed the highest crude protein, while the <i>C.</i> <i>gracilis</i> group had the highest crude fat (<i>p</i> &lt; 0.05). The fatty acid profile of juvenile clams varied by diet, with the <i>C. gracilis</i> group showing the highest EPA and n-3 PUFA, and the <i>I.</i> <i>galbana</i> group exhibiting the highest DHA (<i>p</i> &lt; 0.05). The lipase and α-amylase activities were highest in the <i>C.</i> <i>gracilis</i> group, while the trypsin activity was highest in the <i>S.</i> <i>thamesis</i> group (<i>p</i> &lt; 0.05). In conclusion, <i>C.</i> <i>gracilis</i>, with high nutrient utilization and EPA enrichment, markedly improves juvenile clam growth and is a promising diet for <i>R.</i> <i>philippinarum</i>, while the mixed microalgal diet also shows considerable potential. This study provides a theoretical foundation for optimizing diets in juvenile <i>R.</i> <i>philippinarum</i> cultivation.</p>

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Evaluation of different microalgal diets on feeding efficiency, growth performance, proximate composition, fatty acid composition, and digestive enzyme activities in juvenile Manila clam (Ruditapes philippinarum)

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Jiayi Sun,
  • Xu Chen,
  • Yushun Lu,
  • Jiahuan Wang,
  • Jiongming Zhang,
  • Guoquan Zeng,
  • Xiamin Jiang,
  • Ruibing Peng

摘要

This study aimed to assess the effects of Isochrysis galbana, Streptotheca thamesis, and Chaetoceros gracilis as diets in the rearing of juvenile Ruditapes philippinarum. We evaluated the effects of these microalgae and their mixed diet on the feeding efficiency, growth, nutritional metabolism, and digestive enzyme activity of juvenile R. philippinarum through feeding trials, growth performance analysis, and biochemical assays. Different microalgal diets significantly influenced the feeding efficiency of juvenile clams. The highest filtration rate was observed in the C. gracilis group (p < 0.05), and all groups had survival rates above 97%. The weight gain rate (WGR) was highest in the C. gracilis group, followed by the mixed diet group (p < 0.05). Proximate composition analysis revealed that the I. galbana group showed the highest crude protein, while the C. gracilis group had the highest crude fat (p < 0.05). The fatty acid profile of juvenile clams varied by diet, with the C. gracilis group showing the highest EPA and n-3 PUFA, and the I. galbana group exhibiting the highest DHA (p < 0.05). The lipase and α-amylase activities were highest in the C. gracilis group, while the trypsin activity was highest in the S. thamesis group (p < 0.05). In conclusion, C. gracilis, with high nutrient utilization and EPA enrichment, markedly improves juvenile clam growth and is a promising diet for R. philippinarum, while the mixed microalgal diet also shows considerable potential. This study provides a theoretical foundation for optimizing diets in juvenile R. philippinarum cultivation.