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Recirculating Aquaculture System RAS Technology Global Development Advantages and Challenges
Recirculating Aquaculture System RAS Technology Global Development Advantages and Challenges
What is RAS?
Core Features
1. Recovers up to 99.7% of water, cutting freshwater use drastically.
2. Enables high-density farming through precise water quality control (boosts yields).
3. Reduces wastewater discharge, lowering pollution to oceans and rivers.
4. Operates year-round, unaffected by seasons or climate.
Key Technical Modules
RAS relies on these systems to function:
1. Mechanical filtration: Removes solid waste.
2. Biological filtration: Treats ammonia and nitrites.
3. Disinfection: Uses UV or ozone to kill pathogens.
4. Degassing: Removes excess CO? and supersaturated gases.
5. Heating/cooling: Maintains stable water temperature.
6. Oxygenation: Ensures adequate oxygen supply.
Global RAS Development
1. ~350 commercial RAS projects worldwide (excluding hatcheries), focused in Europe (notably Norway), North America, Asia, and South America.
2. Scales vary: from small modular systems (e.g., AquaFounders Capital’s “Farm in a Box”) to large facilities (e.g., Japan’s Proximar Seafood AS, producing 5,300 tons annually).
3. Shrimp RAS: Currently achieves 50 tons per system; plans to expand to 1,000–2,000 tons.
4. Norway (2022): 16% of total salmon fry output (67.5 million fry over 250g) came from RAS—showing its role in seedling production.
Advantages & Challenges
Advantages
1. Efficient and sustainable.
2. Delivers stable, consistent yields.
Challenges
1. High energy use (for water treatment and temperature control, especially in harsh climates).
2. High upfront construction costs.
3. Requires advanced technical expertise to operate.
4. Sludge/waste treatment is costly—mismanagement can lead to project failure.
