Bioscience Methods 2025, Vol.16, No.5, 238-245 http://bioscipublisher.com/index.php/bm 239 2 Structural Components of Rice-Fish Co-Culture Management 2.1 Field layout and land shaping adaptations In the rice-fish co-cultivation system, how the fields are arranged and how the terrain is shaped are very important. These are directly related to whether rice and aquaculture can produce high yields together. Traditional paddy fields are generally transformed, such as digging ditches or opening ditches on the ridges of the fields, so that fish have places to hide and swim, so that they are easier to survive and grow faster (Jin et al., 2020). This is not only beneficial for fish farming, but also makes the water flow in the fields smoother and the nutrients more evenly distributed, which helps rice grow better. When designing fields, we should not only consider rice, but also take into account the needs of fish. For example, the water should not be too deep or too shallow, and the location of rice planting and fish activities should be arranged reasonably so that both can grow well. 2.2 Hydrological connectivity between paddy and aquaculture areas Effective hydrological connectivity is the basis for the success of rice-fish co-cultivation. This connectivity facilitates the effective exchange of water, nutrients and organisms between rice fields and aquaculture areas, thereby maintaining ecological balance and optimizing output benefits (Jiao et al., 2020). Scientific water management measures, such as precision irrigation and reasonable drainage, are the key to maintaining suitable water levels and water quality, providing a good living environment for fish and ensuring the absorption of water and nutrients by rice (Ohira et al., 2015; Du et al., 2022). 2.3 Framework for coordinated crop-aquaculture management Building a coordinated management framework is the key to achieving a benign interaction between rice cultivation and aquaculture. For example, when rice is planted and harvested should be in sync with when fish are released and caught, so that resources can be better utilized and conflicts between the two operations can be avoided (Li et al., 2025). Another benefit of putting fish in the fields is that fish can eat insects and weeds, which can help reduce pests and diseases. This method does not require too much pesticide, makes the entire system more stable, and increases yields. By establishing a systematic and integrated collaborative management mechanism, the rice-fish farming system can achieve higher economic and environmental benefits (Cazenave et al., 2024). 3 Agronomic Practices for Optimized Rice-Fish Integration 3.1 Adjusted transplanting methods and planting density Planting too densely or inappropriate transplanting methods will affect the effect of the rice-fish system. Adjusting the transplanting method and planting density is the key to increasing the yield of rice and fish. For example, planting rice with dry direct seeding (DSR) not only saves labor and water, but is also more suitable for the current climate than the traditional paddy field transplanting method (PTR). Planting too densely will leave fish no place to move; too sparsely, the rice will not grow well (Duan et al., 2019; Dou et al., 2021). Therefore, the density must be arranged reasonably so that both rice and fish can grow well and the ecology in the field will be more balanced. 3.2 Dynamic water management and alternate wetting-drying Dynamic water management, especially the "wet-dry" (AWD) irrigation technology, is a key strategy to improve water use efficiency and enhance crop resistance in rice-fish co-culture. "Wet-dry" (AWD) means sometimes letting the field dry for a period of time and then irrigating it. This can save water, reduce greenhouse gas emissions, and is good for the environment. At the same time, this method can also help adjust the temperature and quality of water, so fish can survive more easily and grow faster in such water (Figure 1) (Zhang et al., 2023). 3.3 Integrated pest management with eco-friendly approaches The rice-fish system also needs to prevent diseases and pests, but it cannot always rely on pesticides. Integrated pest management (IPM) is to use more environmentally friendly methods to deal with pests. For example, you can grow insect-resistant rice varieties, or you can rely on fish to eat some insects. In this way, less pesticides are used and the ecology of the field is healthier (Kabir and Rainis, 2015). Although this method is good, it is not used much now, mainly because farmers do not understand it and have not learned it. If there is more training and publicity, people will be more willing to use it, and the rice-fish system will become more stable and efficient.
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