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Abstract/Summary
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<jats:p>The peanut worm (<jats:italic>Sipunculus nudus</jats:italic>) is an economically important fishery resource in China. To determine how dietary carbohydrate and protein levels affect the growth performance of juvenile <jats:italic>S. nudus</jats:italic> and identify the mechanisms underlying observed patterns, five isoenergetic and isolipidic diets with different levels of carbohydrate and protein were formulated and fed to juvenile <jats:italic>S. nudus</jats:italic>; the experimental groups were referred to as EG1, EG2, EG3, EG4, and EG5, respectively. After 90 days of feeding, <jats:italic>S. nudus</jats:italic> had significantly lower survival rates when fed D5 compared with other diets (<jats:italic>P</jats:italic> &lt; 0.05), and the highest survival rate was observed in EG2 individuals. The weight gain rate and specific growth rate were significantly higher in EG2 compared with the other groups (<jats:italic>P</jats:italic> &lt; 0.05). Metabolomic profiling using liquid chromatography–mass spectrometry revealed 83 significantly differential metabolites (POS: 59; NEG: 24), which were identified via an in-house MS2 database. Pathway analysis indicated that the significantly different metabolites were involved in 22 metabolic pathways (POS: 9; NEG: 13), including tyrosine, phenylalanine, and tryptophan biosynthesis; phenylalanine metabolism; D-glutamate and D-glutamine metabolism; proline and arginine metabolism; aspartate, alanine, and glutamate metabolism; and aminoacyl-tRNA biosynthesis. These analyses implied that the biosynthetic capabilities of juvenile <jats:italic>S. nudus</jats:italic> were greater in the EG2. The results of this research enhance our understanding of the effects of dietary carbohydrate and protein levels on the growth performance of juvenile <jats:italic>S. nudus</jats:italic>.</jats:p>
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1000
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Hinweis
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