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Screening of lactic acid bacteria from freshwater fish intestines and their effects on growth, immunity, and disease resistance in zebrafish

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Abstract

This study aims to isolate the freshwater fish–derived potential probiotics and evaluate their beneficial effects on the growth, immune response, and disease resistance of juvenile zebrafish (Danio rerio). Herein, three strains (Leuconostoc mesenteroides GL-5, Weissella hellenica GJ-1, and Pediococcus claussenii GJ-3) were identified with antagonistic activity against fish pathogens, high tolerance to 0.1% bile salt, and good hydrophobicity. As the model, zebrafish (15 days post-fertilization, dpf) were fed with a basal diet (control) supplemented with GL-5, GJ-1, GJ-3, heat-killed Leuconostoc mesenteroides GL-5*, and commercial probiotics (positive control) at a concentration of 1 × 107 CFU/mL for 4 weeks. Compared with the GL-5* (36.35 ± 2.03 mg fish−1) and control (37.31 ± 1.91 mg fish−1) groups, the GL-5 (58.15 ± 2.58 mg fish−1), GJ-1 (69.55 ± 3.85 mg fish−1), GJ-3 (62.90 ± 2.99 mg fish−1), and commercial probiotic (62.03 ± 2.68 mg fish−1) treatment were found to significantly promote the growth of zebrafish. Compared to the control group challenged by immersion with 1 × 107 CFU/mL Aeromonas hydrophila, the GJ-3 and positive groups showed the highest transcript levels of IL-1β and TNF-α at 8 h post-challenge (P < 0.05). The survival rates (80%) of the GJ-3 and commercial probiotic–fed groups were significantly higher than that of the control group (50%) at 32 h post-challenge (P < 0.05). Therefore, Pediococcus claussenii GJ-3 can be considered a potential probiotic for reducing the use of antibiotics and preventing bacterial diseases in fish.

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Abbreviations

dpf:

Days post-fertilization

ART:

Antibiotic-resistant bacteria

qPCR:

Quantitative real-time polymerase chain reaction

LAB:

Lactic acid bacteria

EP:

Eppendorf

PBS:

Phosphate-buffered saline

PCR:

Polymerase chain reaction

LB:

Luria-Bertani

MATH:

Microbial adhesion to hydrocarbons

CSH:

Cell surface hydrophobicity

CFU:

Colony-forming unit

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Funding

This work is supported by a grant from the National Key R&D Program of China (2022YFA1304200).

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Authors and Affiliations

Authors

Contributions

X.H.: conceived and designed the experiments and revised the manuscript; Z.X.: conceived and designed the experiments and wrote and revised the manuscript; Huiyu Z.: performed the experiments, analyzed the data, and wrote the manuscript; Q.Z.: analyzed the data and wrote the manuscript; Huiyu Z., Q.Z., Y. L.: analyzed the data. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Zhenjiang Zech Xu or Xiaochang Huang.

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Ethics approval

The animal study was reviewed and approved by the Ethical Committee of Experimental Animal Care of Nanchang University (approval number: 0064257).

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Not applicable.

Competing interests

The authors declare no competing interests.

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Handling Editor: Daniel Merrifield

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Zhang, H., Zhang, Q., Li, Y. et al. Screening of lactic acid bacteria from freshwater fish intestines and their effects on growth, immunity, and disease resistance in zebrafish. Aquacult Int 32, 1647–1664 (2024). https://doi.org/10.1007/s10499-023-01233-1

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  • DOI: https://doi.org/10.1007/s10499-023-01233-1

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