Land-Based RAS

A land-based recirculating aquaculture system is an onshore tank facility that filters and reuses its culture water rather than discharging it, the fully closed-containment form of fish farming. Water passes from the rearing tanks through mechanical solids removal, a biofilter that converts ammonia to nitrate, degassing, and oxygenation before returning, recirculating more than 90 percent of system volume with daily makeup under 10 percent and often 1 percent. Commercial salmon RAS operate at an economic optimum near 97 to 99 percent reuse. Siting on land removes escapes, sea lice, and predator interaction, at high capital and electricity cost.