Higher Production Density
RAS allows controlled production with higher stocking density compared with traditional pond systems.
Recirculating Aquaculture System
Complete Recirculating Aquaculture System (RAS)
Solutions for Commercial Aquaculture
Customized RAS design, engineering, manufacturing, and installation for high-density fish and shrimp farming. YUTANK delivers complete recirculating aquaculture system solutions — from initial concept design to full system commissioning.
- Commercial fish farming
- Shrimp farming
- Hatchery production
- Marine aquaculture
- High-density aquaculture projects
What is RAS
What Is a Recirculating Aquaculture System (RAS)?
A recirculating aquaculture system (RAS) is an advanced aquaculture technology that continuously treats and reuses water inside a controlled farming environment. Unlike traditional pond aquaculture, RAS reduces water exchange by combining mechanical filtration, biological treatment, oxygen management, and water quality control technologies.
A properly designed RAS system helps farmers achieve:
- Higher stocking density
- Lower water consumption
- Stable water quality
- Better biosecurity
- Year-round production
- Controlled farming conditions
Benefits
Why Choose a Recirculating Aquaculture System?
RAS replaces open-water dependence with a controlled, resource-efficient production environment.
Reduced Water Consumption
Water is continuously treated and reused, reducing dependence on large water exchange.
Controlled Farming Environment
Key parameters — DO, temperature, pH and nitrogen compounds — can be managed precisely.
Year-Round Production
RAS enables production independent of seasonal climate conditions.
Culture Tank System
Culture tanks provide a controlled environment for aquatic species.
- Species requirements
- Biomass loading
- Stocking density
- Production targets
- Water circulation requirements
Mechanical Filtration
Mechanical filtration removes suspended solids and organic particles from circulating water.
- Drum filter
- Solid waste removal system
- Reduce organic loading
- Improve water clarity
- Protect biological filtration
Organic Removal
After mechanical solids removal, a protein skimmer removes dissolved, colloidal and fine organic matter through foam fractionation, particularly where organic-load control is required.
- Fine-bubble foam fractionation
- Dissolved and fine organic removal
- Concentrated foam discharge
Biological Filtration
Biological filtration converts toxic nitrogen compounds generated from aquatic animals into safer forms.
- Ammonia removal
- Nitrite conversion
- Biological balance maintenance
Gas Management System
Removes accumulated carbon dioxide and other unwanted dissolved gases before water enters downstream oxygenation.
- CO₂ removal
- Unwanted dissolved gas removal
- Gas balance management
Oxygen Supply System
Oxygen management is critical for intensive aquaculture.
- Oxygen generator
- Oxygen cone
- Aeration system
Water Disinfection
Disinfection helps reduce pathogen risks and maintain stable water quality.
- UV sterilization
- Other water treatment technologies
Components
Complete Commercial RAS System Components
YUTANK provides integrated RAS equipment solutions based on project requirements.
Culture System
：
Aquaculture Tanks
Mechanical Filtration
：
Drum Filter
Biological Treatment
：
MBBR Biofilter
Organic Removal
：
Protein Skimmer
Oxygen Production
：
Oxygen Generator
Oxygen Dissolution
：
Oxygen Cone
Aeration System
：
Air Suspension Blower
Water Disinfection
：
UV System
Monitoring
：
Water Quality Monitoring System
Capacity
<1000 m³
1000–3000 m³
>3000 m³
RAS System Capacity Options
From research-scale systems to full industrial RAS farms — configured to your production target.
<1000 m³
Small Scale RAS System
- Research facilities
- Hatchery projects
- Demonstration farms
1000–3000 m³
Medium Scale Commercial RAS
- Commercial fish farming
- Shrimp production
- Regional aquaculture farms
>3000 m³
Large Industrial RAS Farm
- Factory-scale aquaculture
- Large biomass production
- Commercial seafood supply chains
The capacity ranges above are general project classifications for reference only. Final RAS configuration depends on production target, biomass, species and treatment requirements.
Process
Complete RAS Engineering Process
A RAS project can involve the stages below. YUTANK's scope is defined for each project.
RAS Concept Design
- Target species
- Production goals
- Site conditions
- Water resources
- Climate conditions
System Layout Design
- Culture tank arrangement
- Equipment positioning
- Pipeline planning
- Operation workflow
Biological System Design
- Biomass calculation
- Feed loading analysis
- Oxygen demand calculation
- Biofilter sizing
- Water quality target setting
Hydraulic Calculation
- Water flow requirement
- Recirculation rate
- Pump capacity
- Pipe sizing
- System balance
Equipment Selection
- Biomass loading
- Water quality target
- Production capacity
- Operating requirements
Equipment Manufacturing
- Standard equipment production
- Customized solutions
- OEM manufacturing
Installation Guidance
- Installation drawings
- Technical instructions
- Equipment connection guidance
On-site Installation
- System assembly
- Equipment installation
- Pipeline connection
Commissioning
- Equipment testing
- Water circulation testing
- System adjustment
Project Handover
- Installed equipment review
- Operating requirements
- Maintenance responsibilities
Post-Installation Support
- Support needs agreed for the project
Customization
Customized RAS System Design
Every aquaculture project has different requirements. YUTANK designs systems based on three parameter groups.
Biological Parameters
Species, growth stage, stocking density, feeding rate and production target.
Water Treatment Parameters
Dissolved oxygen, pH, ammonia, nitrite, CO₂ and water exchange requirement.
Engineering Parameters
Total water volume, recirculation rate, hydraulic requirement, equipment configuration and site limitations.
Applications
RAS Applications
Fish Farming RAS
Complete recirculating systems for tilapia, carp, salmon, trout and grouper — for commercial grow-out and hatchery production.
Shrimp RAS
Intensive indoor whiteleg shrimp production with stable water quality and reduced water exchange.
Hatchery RAS
Water treatment configured around the needs of fry, fingerling and nursery stages.
Marine Aquaculture RAS
Controlled marine systems for high-value saltwater species with precise water management.
Projects
Featured RAS Projects
Explore published RAS projects, their site photographs and equipment configurations.
4,900 m³ Largemouth Bass RAS Project
Zhangzhou, Fujian, China
- Species
- Largemouth Bass
- System Water Volume
- 4,900 m³
- Culture Tanks
- 80
- Culture Tank Size
- Ø8 m × 1.5 m; Ø6 m × 1.5 m
Selected Equipment
- Aquaculture Tanks: 80
- Drum Filters: 16
- Protein Skimmers: 12
- Degassing Towers: 10
1,300 m³ European Perch RAS Project
Korla, Xinjiang, China
- Species
- European Perch
- System Water Volume
- 1,300 m³
- Culture Tanks
- 20
- Culture Tank Size
- Ø8 m × 1.5 m
Selected Equipment
- Aquaculture Tanks: 20
- Drum Filters: 4
- Protein Skimmers: 4
- Degassing Towers: 2
2,500 m³ Tilapia RAS Project
Abha, Saudi Arabia
- Species
- Tilapia
- System Water Volume
- 2,500 m³
- Culture Tanks
- 36
- Culture Tank Size
- Ø6 m × 1.5 m
Selected Equipment
- Aquaculture Tanks: 36
- Drum Filters: 6
- Protein Skimmers: 6
- Degassing Towers: 6
Why YUTANK
Why Choose YUTANK for Your RAS Project?
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1
RAS Engineering and Equipment
Published project records document system design, equipment manufacturing, installation and commissioning.
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2
In-House Manufacturing
YUTANK's factory manufactures and assembles aquaculture equipment for RAS projects.
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3
Customized Solutions
Systems designed around your species, capacity and site — not off-the-shelf equipment.
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4
Documented Equipment Development
Selected patent documents cover tank construction, waste removal and water movement.
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5
Published Project Examples
Explore documented RAS work in China, Saudi Arabia, Kazakhstan and Japan.
FAQ
RAS Frequently Asked Questions
01 What does RAS stand for in aquaculture?
RAS stands for Recirculating Aquaculture System. It is a farming method that continuously treats and reuses water, creating a controlled environment for fish or shrimp production.
02 What are the benefits of a recirculating aquaculture system?
The main benefits include higher stocking density, reduced water consumption, stable water quality, better biosecurity, and year-round production.
03 What species can be raised in a RAS?
Common species include tilapia, carp, salmon, trout, grouper, whiteleg shrimp, and various hatchery and marine species.
04 How does a commercial RAS system work?
Water continuously circulates through mechanical filtration, biological filtration, gas management, oxygen supply and disinfection before returning to the culture tanks.
05 What is the minimum capacity for a commercial RAS?
Our published examples include a 240 m³ eel RAS project and several projects above 1,000 m³. Proposed capacity depends on species, site and production requirements.
06 How does YUTANK design a RAS system?
Based on biological, water treatment and engineering parameters, including species, production target, site conditions and water resources.
07 How long does it take to build a RAS farm?
The timeline depends on system capacity, site conditions and the agreed design, installation and commissioning scope.
08 What equipment is included in a complete RAS system?
A complete system typically includes aquaculture tanks, drum filter, MBBR biofilter, protein skimmer, oxygen equipment, UV system and water quality monitoring. Explore Complete RAS Equipment →
09 Can YUTANK customize a RAS system for my farm?
Yes. Every system is customized based on your target species, production capacity and site conditions.
10 Does YUTANK provide installation and after-sales support?
Published projects document on-site installation and commissioning. Post-installation support and handover requirements are agreed for each project.
Start Your RAS Project
Planning a RAS Project?
Tell us what you plan to farm, your production goals, project location and current project stage. We can start by understanding your requirements before defining the appropriate RAS configuration.
You don't need a complete equipment list to get started.
- Species or application
- Production target or required capacity
- Project location and water source
- Current project stage
- Any known site or technical requirements