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


Innovation & Investment

A review of unit processes in RAS systems

Since un-ionized ammonia-nitrogen and nitrite-nitrogen are toxic to most finfish, controlling their concentrations in culture tanks is a primary objective in the design of recirculating aquaculture systems. 

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Health & Welfare

Ammonia toxicity degrades animal health, growth

Ammonia nitrogen occurs in aquaculture systems as a waste product of protein metabolism by aquatic animals and degradation of organic matter, or in nitrogen fertilizers. Exposure can reduce growth and increase susceptibility to diseases in aquatic species. 

Health & Welfare

High nitrate levels toxic to shrimp

Shrimp exposed to high concentrations of nitrate exhibit shorter antennae, gill abnormalities and hepatopancreas lesions. Nitrate toxicity is more of an issue for shrimp raised in lower-salinity waters. 

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. 

Innovation & Investment

Low-space bioreactors remove ammonia in recirculating systems

Despite their relatively small footprint, low-space bioreactors deliver sustainable and cost-effective biological wastewater treatment, particularly in recirculating aquaculture systems, where ammonia removal is critical.