With fisheries around the world close to or beyond sustainable limits, and current health recommendations advising an increased intake of oily fish to help protect against heart disease, governments are warning that that the only way to satisfy consumer demand is the continued growth of aquaculture.
The good news is that fish farms can increase stocking densities and improve yields by up to one-third by specifying PSA oxygen applications from gas separation specialist Oxair, which can introduce oxygen to fish tanks in its pure form. The benefits of oxygenation are well known within the aquaculture industry: fish require at least 80 percent oxygen saturation in the water for optimal growth. Insufficient oxygen levels cause poor digestion in the fish, so that they require more food and the risk of illness also increases.
Conventional oxygenation methods, based on the addition of air alone, quickly reach their limits because, in addition to the 21 percent oxygen that air contains, air also contains other gases, in particular nitrogen. Applying the same technology as that used in medical facilities, Oxair’s gas generators use Pressure Swing Adsorption to introduce pure oxygen directly into the water. This enables the production of much greater quantities of fish in a comparatively small volume of water and causes the fish to grow larger as well. This enables even small enterprises to farm considerably more biomass, making it easier for them to assert themselves in the economic environment.
James Newell, Oxair’s CEO, explained, “We supply PSA equipment for many facilities around the world, from aquacultures in Singapore to the University of Tasmania’s research facility. Our installation at a barramundi farm in Darwin has shown that, for every 1kg of oxygen pumped into the water, 1kg of fish growth results. Our generators are currently being used to farm salmon, eels, trout, prawns and snapper, among other varieties, at a global level."
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