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Effects of dietary compound probiotics and heat-killed compound probiotics on antioxidative capacity, plasma biochemical parameters, intestinal morphology, and microbiota of Cyprinus carpio haematopterus

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Abstract

This study investigated the compound probiotics and heat-killed compound probiotics on antioxidants, plasma biochemical parameters, intestinal histopathology, and microbiome of koi fish, Cyprinus carpio haematopterus. Koi fish (15.9 ± 0.63 g) were fed with five different diets: C (control, basal diet without probiotics), D3 (3% compound probiotics), D6 (6% compound probiotics), lnaD3 (3% heat-killed compound probiotics), and lnaD6 (6% heat-killed compound probiotics). After 28 days of the feeding trial, results showed that the activities of acid phosphatase (ACP), alkaline phosphatase (AKP), catalase (CAT), and total superoxide dismutase (T-SOD) were significantly improved in koi fish fed with heat-killed compound probiotics compared to the control group (P < 0.05). Interestingly, total activities of glutamyl oxaloacetic transaminase (GOT), total protein (TP), albumin (TA), globulin (GLB), and triglyceride (TG) were significantly improved in koi fish fed with compound probiotics compared to the control group (P < 0.05). The intestinal muscular and intestinal villi height of lnaD3 was significantly higher than other groups (P < 0.05). In addition, compound probiotics and heat-killed compound probiotics increased the diversity of intestinal microbes. Therefore, dietary supplementation with heat-killed compound probiotics can be an effective measure for improving nonspecific immune response, intestinal morphology, and the flora of koi fish.

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All data, models, and code generated or used during the study appear in the submitted article.

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Acknowledgements

Thanks to Dalian Shengtai Biology Science and Technology Co., Ltd for providing the compound probiotics.

Funding

This work was supported by the Development and Demonstration of Efficient Green Production Mode of Important Seawater Fish in Liaoning (grant numbers 2020JH1/10200002) and the Project for Dalian Youth Star of Science and Technology (grant numbers 2019RQ137).

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Contributions

Lin Wu wrote the manuscript and collected the data. Yuzhe Han revised the manuscript. Tongjun Ren provided funding acquisition and revised the manuscript. Others provided help for this experiment.

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Correspondence to Tongjun Ren.

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The authors declare no competing interests.

Ethics approval

The experimental processes in this research confirmed to the Guidelines of the Care and Use of Laboratory Animals in China, and the study was approved by the ethics committee of Dalian Ocean University.

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The authors declare no competing interests.

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Handling editor: Gavin Burnell

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Wu, L., Wang, L., Cui, S. et al. Effects of dietary compound probiotics and heat-killed compound probiotics on antioxidative capacity, plasma biochemical parameters, intestinal morphology, and microbiota of Cyprinus carpio haematopterus. Aquacult Int 31, 2199–2219 (2023). https://doi.org/10.1007/s10499-023-01080-0

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  • DOI: https://doi.org/10.1007/s10499-023-01080-0

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