Enhancing biomass and ecological sustainability in rice–fish cocropping systems through the induction of functional microbiota with compound biogenic bait

Highlights

● Compound biological bait can replace commercial bait to ensure fish growth.

● The compound biogenic bait can effectively improve the water and soil environment.

● The key microbiome induced by compound biogenic bait plays an important role.

Abstract

Traditional commercial aquatic fish bait (CA) is not conducive to the scientific breeding of rice and fish in cocropping systems, and excessive feeding easily causes environmental pollution in rice fields. In this study, an environment-friendly compound biogenic bait (CB) mixed with plant-derived (PB) and animal-derived (AB) baits was proposed. The rice–crucian carp cocropping system was used as the research object, and the soil microorganisms and fish gut microorganisms were sequenced with high throughput, respectively, to verify the effect of CB application and the microbial mechanism underlying its functional effect. The results showed that the AB and PB components in CB maintain the growth of fish by improving the metabolism-related functions of fish gut microbiome and reducing the abundance of intestinal pathogenic bacteria, including Actinomadura. In particular, the PB components induced soil microbiome, such as Pseudonocardia, that participate in soil nutrient cycling and increase dissolved oxygen in water, which is key for improving rice quality and yield. This is the first study to focus on how different bait components drive key microbial communities to regulate animal–plant–environment relationships in the integrated planting and breeding patterns of paddy fields.

Graphical abstract

Keywords

rice soil / rice–fish cocropping / fish bait / high-throughput sequencing / microbial community

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Declaration of competing interest

The authors declare to have no conflict of interest.

Data availability

Data will be made available on request.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 32001210), the Opening Project of Jiangsu Province Engineering Research Center of Agricultural and Rural Pollution Prevention Technology and Equipment (Grant No. GCZXZD2301), and the Natural Science Foundation of the Jiangsu Higher Education Institution of China (Grant No. 22KJB180003).

Electronic supplementary material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s42832-024-0252-4 and is accessible for authorized users.

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