Abstract:

To summarize the establishment experience and evaluate the comprehensive benefits of the “Tongxiang Model” for high-quality development in rice-fish coculture，this study systematically analyzed the trilateral synergy mechanism integrating government，technology，and service sectors through policy review，field experiments，and cost-benefit accounting. The analysis drew on Tongxiang City's industrial practices from 2018 to 2025，with focused evaluation of five co-culture models including rice-crayfish and rice-giant river prawn. Results demonstrated that regarding institutional innovation，Tongxiang established a synergistic system featuring policy guidance，technical support，and service guarantees. For technical pathways，a diversified model system dominated by rice-crayfish co-culture emerged. In 2023，the economic benefit of the rice-crayfish symbiotic model was 52 323 yuan per hectare，while that of the crop rotation model was 17 541 yuan per hectare， and the economic benefits under the rice-giant river prawn，rice-turtle，rice-frog，and early rice-green shrimp cultivation models were 46 350，114 225，185 250 and 50 400 yuan per hectare，respectively. The city's total area dedicated to integrated rice-fish coculture reached 2 219.72 hm²，achieving stable grain production with increased income，reduced fertilizer and pesticide use，and improved economic efficiency. By driving technical optimization through institutional innovation，the “Tongxiang Model” significantly elevated industrial quality and profitability，offering a replicable pathway for upgrading agriculture in southern rice-growing regions.

Key words: Tongxiang Model, rice-fish coculture, institutional innovation, effectiveness evaluation