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Evaluation of growth, immune characteristics and gut microbiota of juvenile sea cucumber Apostichopus japonicus fed with fermented feed from Corynebacterium glutamicum

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Abstract

As a kind of green and high quality feed, fermented feed has the activity of promoting growth and improving immunity in aquaculture. The aim of this study was to develop a new liquid fermented feed for the culture of sea cucumber Apostichopus japonicus and evaluate its nutritional value and function. After the commercial feed of the sea cucumber was fermented by Corynebacterium glutamicum, the contents of crude protein, free amino acids, palmitoleic acid, linoleic acid, arachidonic acid, and the total content of polyunsaturated fatty acids were significantly increased. By feeding the fermented food, the weight gain rate, special growth rate and feed conversion rate of the sea cucumber were significantly increased, and the mortality rate was significantly reduced in the challenge test. The cellulase activity in the gut of the sea cucumber fed with the fermented feed was significantly increased, while the activities of alkaline phosphatase, acid phosphatase, total nitric oxide synthase, catalase, and lysozyme in the coelomic fluid were significantly increased. The fermented feed changed the gut microbiota of the sea cucumber and significantly reduced the relative abundance of Vibrio, which was the main pathogen causing skin ulcer syndrome. Transcriptome analysis revealed 4492 differentially expressed genes that can be enriched in biological processes such as immune system processes and immune responses, and affect the growth performance and immune regulation of the sea cucumber through metabolic pathways such as ribosomal biogenesis. Further gene expression analysis showed that the upregulation of genes such as NFκBI, TLR, TLR3, TRAF6, MyD88, and p38 activated the TLR signaling pathway and enhances the immune response of the sea cucumber. Therefore, C. glutamicum fermented feed can promote the growth of the sea cucumber, enhance non-specific immunity, and resist pathogen infection, making it a highly promising feed for application.

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The data are available from the corresponding author based on reasonable requests.

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Acknowledgements

This work was supported by Open Foundation of Dalian **shiwan Laboratory (2024015), the Research Project of Applied Basic Research Program of Department of Science & Technology of Liaoning Province (2022JH2/101300137), and Open Fund of Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education (KF2022007), China.

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Contributions

Jiarong Cui: methodology, formal analysis. **aofei Tan: software, data curation. Zixuan Xu: writing—original draft preparation, validation. **nyu Sun: investigation. Liang Wang: funding acquisition. Honglei Zhan: resources. Yujia Liu: visualization. Ying Li: conceptualization, funding acquisition. Bingnan Liu: conceptualization, writing—original draft preparation, project administration.

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Correspondence to Bingnan Liu.

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The authors declare no competing interests.

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No approval of research ethics committees was required to accomplish the goals of this study because experimental work was conducted with an unregulated invertebrate species.

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The authors declare no competing interests.

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Cui, J., Tan, X., Xu, Z. et al. Evaluation of growth, immune characteristics and gut microbiota of juvenile sea cucumber Apostichopus japonicus fed with fermented feed from Corynebacterium glutamicum. Aquacult Int (2024). https://doi.org/10.1007/s10499-024-01490-8

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  • DOI: https://doi.org/10.1007/s10499-024-01490-8

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