The application of Roots fans in fishery aquaculture is mainly to provide sufficient oxygen. Specifically, Roots fans can be used in the following areas in aquaculture systems:

1. Oxygenation: Increasing the dissolved oxygen content of the water body by pressing air into the water, which is especially important for high-density farming, which requires more oxygen to support the survival and growth of fish.

2. Recirculating water system: In a recirculating water aquaculture system, Roots fans can help to push the water flow and maintain the water flow, which helps to remove waste and keep the water clean.

3. Bottom Aeration: In pond aquaculture, Roots fans can deliver air to the bottom of the pond through pipes to promote the oxidative decomposition of bottom sediments, improve the substrate environment, and reduce the accumulation of harmful gases such as hydrogen sulfide.

4. Climate control: In closed aquaculture systems, Roots fans can also help regulate water temperature and air quality, creating a more stable growing environment for fish.