Innovation & Investment
Ozone increases productivity in RAS systems
Studies on improving water quality in recirculating aquaculture systems has identified ozone as an excellent solution for an optimal water environment.
Health & Welfare
Off-flavors in salmonids raised in RAS
The presence of compounds such as geosmin and 2-methylisoborneol (MIB) in recirculating aquaculture systems (RAS) can result in earthy or musty off-flavors in salmonids raised in the systems.
Responsibility
Geotextile bags enhance effluent management in demo aquaculture system
One promising new technology for dewatering aquaculture solid waste is the use of geotextile bags: porous, sealed tubular containers constructed of high-strength, woven polyethylene material.
Health & Welfare
Floating closed-containment aquaculture
Floating closed-containment systems incorporate low-pressure pumping, oxygen supplementation, solid-waste separation and efficient feed management.
Health & Welfare
Product improves nitrification in RAS
Healthy populations of both ammonia- and nitrite-oxidizing bacteria must be present in aquaculture systems to support the nitrification of potentially toxic ammonia to nitrite, with further oxidation to less problematic nitrate.
Health & Welfare
Norwegian salmon smolt farms embracing RAS to raise production
Smolt production in Norwegian hatcheries will likely increase during the next decade to answer salmon grow-out needs. Farmers are converting existing flow-through systems to partially or fully incorporate recirculation technologies.
Health & Welfare
Nitrifying biofilms critical for water quality in intensive shrimp RAS
Nitrifying bacteria readily form biofilms on surfaces, and colonization by these important bacteria on the interior walls of RAS production units likely provides an additional source of nitrification.
Health & Welfare
Rainbow trout attain good growth, health in tank-based recirculating systems
Circular tank-based recirculating aquaculture systems can be used to effectively culture rainbow trout and other salmonids in a bio-secure and environmentally friendly manner that imposes a much lower water and wastewater footprint than traditional flow-through culture technologies.
Responsibility
Hydrogen peroxide: Disinfectant for recirculating aquaculture systems
Hydrogen peroxide is a candidate for water treatment in aquaculture systems for it has antimicrobial effects and easily degrades to harmless byproducts.
Health & Welfare
New Norwegian RAS farm produces salmon smolts
The Fjordsmolt RAS farm applies a relatively simple, low-cost design to produce millions of salmon smolts per year in fiberglass tanks.
Responsibility
Evaluating low-energy recirculating system for inland production of marine finfish juveniles
U.S. institutions are collaborating to evaluate low-energy recirculating aquaculture system designs to produce marine finfish in a low-salinity environment.
Health & Welfare
‘Boutique’ RAS for spotted sea trout
A boutique design project validated a land-based, recirculating production system capable of producing 50 metric tons of spotted sea trout per year.
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.
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.
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.