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

The first line of defense in the RAS system removes solid particles like uneaten feed and feces using mechanical filtration equipment such as microstrainers and sand filters with precision around several tens of micrometers.

This crucial component uses microorganisms to decompose harmful substances like ammonia nitrogen and nitrite. Biological filters filled with ceramic rings or biochemical balls provide attachment sites for beneficial nitrifying bacteria.

Ensures sufficient oxygen supply through microporous aerators or pure oxygen aeration devices, maintaining optimal dissolved oxygen levels for high-density aquaculture conditions.

Eliminates pathogens using UV disinfection or ozone generators, with ozone decomposing into oxygen after treatment leaving no harmful residues.

• Water recycling: Achieves 90-99% water reuse compared to traditional aquaculture methods
• Space efficiency: Enables high-density aquaculture with yields per square meter significantly higher than traditional methods

• Stable water quality: Maintains precise control of temperature, pH, dissolved oxygen, ammonia nitrogen, and nitrite levels
• Custom conditions: Adjustable temperature and light conditions tailored to specific species requirements

• Uniform growth: Consistent size and quality across all specimens
• Enhanced safety: Reduced pathogen exposure and harmful substance accumulation

• Minimal wastewater: Dramatically reduces water discharge and environmental impact
• Ecosystem protection: Prevents species escape and maintains natural water quality

Enables high-density aquaculture in limited urban spaces like warehouses or building basements, providing fresh seafood directly to restaurants and markets.

Ideal for premium species like grouper and rainbow trout, offering precise environmental control for optimal growth conditions and product quality.

Provides stable conditions for seedling development with controlled water quality and temperature, significantly improving survival rates.

Creates controlled experimental environments for scientific studies and hands-on aquaculture training.