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Message: [QUOTE="crsublette, post: 303557, member: 3847"] Not necessarily. Using liquid oxygen or tank oxygen or an oxygen concentrator or an air pump using atmospheric oxygen... depends on the cost of obtaining that oxygen. Air pumps are actually the most expensive way to inject oxygen into the water, but using pure oxygen is quite expensive if you do NOT have the livestock density to justify the expense.. Reason aquaculture farms run at high densities is so they can compete with an import economy flooding the market with very cheap fish. There has been talk about organic certification of fish to help aquaculture farms grow healthier fish, but, unfortunately and oddly, there has been tremendous push back. The fish densities grown in ocean net cages or lake cages or earth ponds are no more "natural" than RAS and actually are worse since those other aquaculture approaches involve minimum filtration and pollutes oceans and freshwater repositories. Only RAS has the option to actually keeps waste seperated from the fish so it can be properly recycled. [/QUOTE]