The Recirculating Aquaculture System (RAS) is an industrial aquaculture model that enables water recycling through advanced treatment technologies including physical filtration, biological filtration, oxygenation, and disinfection. This closed-loop system simulates natural ecosystem processes, converting organic waste into harmless substances while maintaining stable water quality for optimal aquatic growth conditions.

The first line of defense in RAS, removing solid particles like uneaten feed and feces. Utilizes mechanical filtration equipment including drum filters, microstrainers, and sand filters with precision up to several tens of micrometers to protect downstream equipment and maintain water quality.

Core component using microorganisms to decompose harmful substances like ammonia nitrogen and nitrite. Features biological filters filled with ceramic rings or biochemical balls that provide attachment sites for nitrifying bacteria, converting ammonia nitrogen into nitrate.

Ensures sufficient oxygen supply through microporous aerators or pure oxygen aeration devices. These systems efficiently increase dissolved oxygen levels to meet demands of high-density aquaculture.

Eliminates pathogens using UV disinfection devices or ozone generators. UV damages pathogen DNA while ozone's strong oxidation kills microorganisms, decomposing into oxygen without harmful residues.

Ideal for space-constrained urban environments, enabling high-density facilities in warehouses or basements. Used by seafood restaurants for fresh supply of perch and tilapia, reducing transportation needs while ensuring quality.

Perfect for premium species like grouper and rainbow trout, providing precise environmental control (22-28°C water temperature, 25-35‰ salinity) to enhance growth rates, meat quality, and disease resistance.

Maintains optimal conditions for shrimp seedlings (28-32°C water temperature) with minimal ammonia nitrogen levels, significantly improving survival rates and development quality.

Provides controlled environments for studying growth hormone impacts and practical aquaculture education, allowing parameter adjustments and real-time observation of aquatic behavior.