Colasit system technology for sustainable breeding of fish, seafood and aquatic plants

Individual solutions in plastic construction

Aquaculture plants as Recirculating Aquaculture Systems (RAS), recirculating systems


Aquaculture plants as recirculating aquaculture systems (RAS), recirculation systems. Colasit aquaculture plants for fish, algae or crustaceans are recirculation systems or recirculation systems in tanks. The water is cleaned using integrated water treatment system and returned to the fish tank. 

Recirculation systems consist of holding tanks and subsequent mechanical and biological water treatment, e.g., using drum filters and moving bed filters. Disinfection with UV irradiation or ozonation is offered as an option. Water treatment in recirculation systems is necessary to remove accumulating feed residues, faeces and metabolic end products - primarily "waste" products from protein metabolism - from the system. Otherwise, harmful concentrations of pollutants arise for the animals in the tanks.

Engineering, fish tanks, moving bed bio reactor, airlift, breeding channels, degassing system made of plastic - Colasit

Aquaculture plant with biological water treatment

Complete system for sustainable fish farming, breeding shellfish and producing aquatic plants - Colasit

Aquaculture plant for fish farming made of PE thermoplastic

The Recirculating Aquaculture System (RAS) is characterised by:
  • Controlled system
  • Low water consumption
  • Location-independent
  • Year-round production 
  • Shortened production cycle
  • Low wastewater quantities
  • Natural waters are not contaminated

Despite high operating and investment cost, RAS systems are considered sustainable because wastewater from RAS systems can be discharged via the sewer system and does not contribute any nutrients to natural water bodies. 

In comparison, flow-through systems offer advantages thanks to their simplicity and the lower investment capital requirement. However, they generate high energy costs, use a great deal of water and emit large quantities of water contaminated with nutrients into the environment.

Data sheets, brochures for aquaculture plants

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Michel Kropf
Beat Stauffer
Stephan Blaser