Bioscience Methods 2025, Vol.16, No.5, 238-245 http://bioscipublisher.com/index.php/bm 242 As a demonstration base, Zhejiang Qingxi Turtle Industry Co., Ltd. has started continuous turtle-rice rotation experiments since 1999, and has been conducting turtle-rice symbiosis experiments since 2010. Through more than 50 different models of experiments and control experiments, it has explored a variety of successful turtle-rice rotation and symbiosis models, accumulated relatively mature experience, and has been fully affirmed by the Fisheries Bureau of the Ministry of Agriculture, the National Aquatic Technology Extension Center, the Provincial Ocean and Fisheries Bureau and other superior departments and leaders. The modern and advanced agricultural production model of turtle-rice symbiosis and rotation has not only improved economic benefits, but also ensured the stability of grain planting area, solved the worries of "what to do with grain", played a role in stabilizing grain and increasing income, and effectively promoted social stability and security. At the same time, it also played a good demonstration role, driving other aquaculture farmers to try and innovate (Wang et al., 2023). 6.2 Ecological cycling in rice-fish systems of Guangxi The rice-fish integrated farming model has improved the ecological environment of rice fields. Rice-fish intercropping, fish feed on pests and weeds in rice fields, and rice uses fish feces as fertilizer, creating good growth conditions for rice growth. After the ban on pesticides and chemical fertilizers, the quality of rice has been greatly improved (Jin et al., 2020). This model has the advantages of increasing grain, increasing fertilizer, saving land, and being green and environmentally friendly. It also has the advantages of "not competing with people for grain, not competing with grain for land", achieving multiple uses of one field and one water, which not only ensures food security but also promotes farmers' income. In the early years, crayfish became a delicacy on the table, pond farming gradually became saturated, and the growth of farming scale was hindered, so people turned their attention to idle paddy fields. Unexpectedly, the water layer depth and water quality of the rice fields were just right for them, as if they had found a home suitable for their growth. After little by little experiments by farmers in Pengze County, Jiujiang City, Jiangxi Province, the integrated rice-fish farming model, which mainly focuses on rice-crabs, rice-fishes and rice-turtles, has gradually matured. Crayfish are raised in rice fields in spring, and crabs and Pengze crucian carp are raised in rice fields in summer. This has formed a benign co-cultivation model of "one rice, one shrimp, one crab and one fish", which has improved the comprehensive utilization efficiency of agricultural land and achieved the "three wins" goal of economic benefits, social benefits and ecological benefits. Pengze County has also actively innovated and practiced the combination of agriculture and tourism, agriculture and commerce, and agriculture and research, and promoted the integration of the industrial chain and the improvement of the value chain of the integrated rice-fish farming model. 6.3 Standardized and smart-controlled rice-shrimp systems in Sichuan The rice-shrimp co-cultivation model does not destroy the field structure, which is conducive to the mechanization, large-scale planting and full planting of rice. At the same time, because crayfish are omnivores, they can eat grass and insects, effectively inhibiting the damage of weeds and pests during the rice planting season. Their feces, feed residues and shrimp shells can also fertilize the fields. When planting rice, basically no herbicides and insecticides are used, and the amount of pesticides is reduced by more than 90%, and the amount of chemical fertilizers is reduced by more than 50%. The quality of rice products is excellent. At the same time, the residual water after drainage from the cultivation of crayfish in the winter idle season can meet the water demand for rice planting. The rice planting process can also purify the rice fields, which has a significant protective effect on the ecology and water resources (Xu et al., 2023). Xingwen County, Sichuan Province has developed a total area of about 67 000 mu of rice and shrimp farming, with an annual output of about 4 500 tons, of which a large number of crayfish are sold by air. In order to solve the transportation problem, the Yibin Early Shrimp Industry Federation and others formally signed the "South Sichuan Early Shrimp Air Transport Service Agreement" with Yibin Airport Air Port Logistics Co., Ltd., and the South Sichuan Early Shrimp obtained nearly 10 air logistics transportation rights with preferential prices and priority services, and the highest comprehensive cost reduction was about 5 cents per catty.
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