Health & Welfare
Commercial-scale RAS trial yields record shrimp production
A super-intensive, commercial-scale RAS trial with Pacific white shrimp at Oceanic Institute achieved record production at a low cost and with low stocking densities.
Responsibility
Membrane biological reactor technology supports wastewater reclamation reuse
Membrane biological reactor technology is a scalable wastewater treatment system that reclaims water discharged from RAS solids-collection devices.
Innovation & Investment
Cavitation, the ‘pump disease’
Cavitation occurs in a centrifugal pump when the effects of low internal water pressure lead to impeller damage. Proper design and installation of pumping systems can help.
Responsibility
Health management in recirculating systems
Recirculating systems and health management schemes should be designed concurrently to maximize their effectiveness.
Health & Welfare
Super-intensive RAS trial yields encouraging shrimp harvest at Oceanic Institute
A super-intensive RAS grow-out trial produced 5.7 kg of shrimp per square meter in 14 weeks using minimal water volume and only 0.34 percent daily water exchange.
Responsibility
Varied microbes important to recirculating aquaculture systems
Microbes facilitate high-intensity recirculating aquaculture systems. Research indicates that the microbial community changes throughout grow-out.
Health & Welfare
Prototype RAS raises larval penaeid shrimp
RAS technology can be applied to shrimp culture. The author developed a small-scale prototype RAS for shrimp larval culture that successfully reared monodon nauplii to PL15.
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.
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
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.