News features and technical articles about the evolution of aquaculture, one of the world’s fastest growing industries.

RAS

Innovation & Investment

Optimizing depuration of salmon in RAS

A study to evaluated operating practices and system designs that could potentially enhance depuration of off-flavors from Atlantic salmon cultured in a semi-commercial-scale freshwater recirculating aquaculture system. 

Responsibility

A look at unit processes in RAS systems

The ability to maintain adequate oxygen levels can be a limiting factor in carrying capacities for RAS. The amount of oxygen required is largely dictated by the feed rate and length of time waste solids remain within the systems. 

Health & Welfare

Cobia culture in recirculating systems

A unique pilot project supported by northern Chile’s biggest power-generating company and the Undersecretary of Fisheries and Aquaculture is raising cobia in a recirculating aquaculture system in the desert. 

Innovation & Investment

Recirculation meets aquaponics

Today’s aquaculture industry is rapidly adopting recirculating aquaculture systems (RAS) for hatchery and nursery applications. Recently, there has been a move to combine RAS technology with the floating raft aquaponics. 

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. 

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

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.