Health & Welfare
RAS polyculture of channel catfish, Nile tilapia
High-density RAS polyculture of channel catfish and tilapia in tanks or raceways has several advantages over traditional pond culture.
Responsibility
Settler evaluation: Radial flow vs tangential flow
In a study, a radial-flow settler provided approximately twice the TSS removal efficiency of a comparable swirl separator.
Responsibility
Coagulation and flocculation aids remove suspended solids, phosphorus from RAS effluents
Phosphorus is one of the most scrutinized nutrients discharged by aquaculture systems, due to its potential eutrifying impact on receiving bodies of water.
Intelligence
Survey defines RAS finfish aquaculture in United States, Canada
Recirculating aquaculture systems (RAS) has moved beyond research and development to claiming a growing share of commercial finfish aquaculture production.
Health & Welfare
Genetic improvement of tilapia at commercial RAS
A study of hybrid tilapia breeding represents the minimum scale needed for achieving successful, in-house selective breeding.
Responsibility
Denitrification in recirculating aquaculture systems: Comparison of aquatic plants
Denitrification by anaerobic bacteria can remove nitrates from RAS, but the operation requires anaerobic conditions and the addition of carbon sources.
Intelligence
Recirculating plant in Spain produces turbot
A farm in Cambados, Galicia, is producing turbot with recirculating technology from Norway to reduce the growing period by controlling water temperature.
Intelligence
Biofilters: Choosing your substrate
Heterotrophic and autotrophic bacterial communities supported within a biofilter naturally process organic wastes and provide biologically stable water.
Intelligence
Bead filter enhances RAS for tilapia production
The performance of a bubble-washed bead filter with partial solids removal was evaluated at the University of Arkansas in Pine Bluff.
Intelligence
Tilapia farming in Ontario, Canada
Eastern Tilapia Inc. in Ontario, Canada, is proving that recirculating culture systems can be set up in and run in unconventional locations.
Aquafeeds
Feed management for RAS, part 1
RAS inputs and outputs are easily quantified, but even an efficient system will appear to have higher operating costs than a traditional pond.
Intelligence
Recirculating aquaculture systems in freshwater salmon hatcheries
With improvements in water recirculation technology, the time has come to seriously consider RAS in a freshwater salmon hatchery.
Responsibility
Drum filter efficiency as particle separator in a recirculated system
Drum filters have been shown to be efficient in tests, although the effect of using different mesh sizes has not been clearly determined.
Intelligence
Treatment of recirculating waters with floating bead bioclarifiers
Bead filters compete very well as bioclarifiers and are used in combination with fluidized beds to tackle solids capture and biofiltration needs.