Aquaculture France - Closed-Circuit Aquaculture Systems (RAS)

An RAS operates through several essential stages:

1. Raising tanks: Designed to ensure uniform water volume and facilitate the removal of organic waste (feces and uneaten food).
2. Mechanical filtration: Removes solid particles such as feces and food residues.
3. Biological filtration: Houses nitrifying bacteria that convert toxic ammonia into less harmful nitrates.
4. Disinfection: The use of UV lamps or ozone eliminates pathogenic germs present in the water.
5. Aeration and oxygenation: The addition of air or oxygen removes CO2 produced by fish metabolism and enriches the water with oxygen for respiration.
6. Temperature control: Heating or cooling equipment maintains the optimal water temperature for fish growth and reproduction.
7. Regulation of parameters: Controls temperature, pH, salinity, and other factors to ensure optimal fish growth.

• Water savings (reduces consumption by 90-99%)
• Precise control over farming conditions
• Reduction of diseases and parasite
• Lower environmental impact