Abstract
The aquaculture sector faces a trilemma of simultaneously boosting production, decreasing nutrient discharges and reducing CO2 emissions. Here we evaluate the growth trajectories and ecological footprints of different aquaculture systems in China, considering both business as usual and ecological transformation scenarios, and anticipate the evolution of sustainable aquaculture in the post-carbon neutrality era. We explore a two-step approach involving ecological transformation and green aquaculture. By adjusting the annual growth rates of six out of nine aquaculture systems, energy use, nitrogen discharge, land use and freshwater usage per unit of mass gain could be reduced by 1.70%, 6.89%, 7.12% and 8.86%, respectively, by 2050 compared with the business as usual levels. Owing to changes in the energy supply mix in China, by 2050, the total CO2 emissions from aquaculture will only increase by 5.7% compared with the level in 2021. Once carbon neutrality is attained, the focus should shift to mitigating nutrient discharges. Our findings underscore the necessity for substantial improvement in the Chinese aquaculture development plan and offer a blueprint for sustainable aquaculture advancement for guiding policy and practice.
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Data availability
The results that support the findings of the study are provided in the main text and Supplementary Information. The sources of all data used in this study are referenced in Methods. The details are as follows: data on production and areas of aquaculture systems were sourced from the China Fishery Statistical Yearbook (China Agriculture Press, 2022, 2024; refs. 14,48). Data on discharge coefficients of pollution sources in aquaculture were taken from the Handbook of the First National Census of Pollution Sources (China Pollution Source Census, 2009; ref. 17). The energy consumption of aquatic products from different aquaculture systems in China was from https://www.china-fishery.com/scxuebao/article/abstract/20101207278 (ref. 16). Information on the total water footprint for freshwater species and mariculture species was derived from previous studies50,51,52. The GHG data were collected from https://doi.org/10.1038/s43016-024-01004-y (ref. 45). Source data are provided with this paper.
Code availability
All related codes can be found via GitHub at https://github.com/lujianseng/Aquaculture-Trilemma-.
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Acknowledgements
This study was funded by the National Natural Science Foundation of China (32373105 (S.-L.D.) and 42025604 (Y.-W.D.)).
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S.-L.D. and Y.-W.D. designed the research. S.-L.D., W.-J.L., M.H., Y.-X.S., Y.-Y.Z., S.-E.Y., Y.-G.Z., L.L. and Y.-W.D. analysed the data and performed the statistical analysis. S.-L.D., Y.-G.Z., L.L. and Y.-W.D. interpreted the data. S.-L.D., L.C. and Y.-W.D. wrote the paper and have primary responsibility for the final content. All of the authors have read and agreed to the published version of the paper.
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Dong, SL., Cao, L., Liu, WJ. et al. System-specific aquaculture annual growth rates can mitigate the trilemma of production, pollution and carbon dioxide emissions in China. Nat Food 6, 365–374 (2025). https://doi.org/10.1038/s43016-025-01122-1
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DOI: https://doi.org/10.1038/s43016-025-01122-1