An integrated recirculating aquaculture system (RAS) for land-based fish farming: The effects on water quality and fish production

► A land-based recirculating aquaculture system (RAS) was established. ► The biological pond functioned as a sink for nutrient retention. ► The constructed wetlands and the ecological ditch purified the water. ► The combined treatment lowered the trophic status of the recirculating ponds. ► RAS could be more suitable for sensitive species to water quality.