Portable Farms just announced a "Salmon Aquaponics System" - (portablefarm dot com slash farm2011 slash salmon-aquaponics). I'm pretty surprised by this as I thought salmon were salt-water fish. The entire web page just talks about dealing with temperature differentials. Anyone have any idea what is going on here? Why wouldn't you just call that a Trout System?
Salmon need extremely good water quality and the filtration required for a >50% recirculating system is massive.
This simply means that with a salmon farm that size you could attach an aquaponics farm for >50% recirculation/filtration that is even larger. You would probably make more from the tremendous amount of vegetables and fruit than from the fish at that scale!
I think the reason behind all of these stories is the capital cost of filtration equipement and the ongoing maintenance and pumping costs are too expensive to turn a profit.
Because traditional fish farm filtration did not in and of itself generate any revenue, whereas an aquaponic farm as fish farm filtration would return additional profits off the same given cost of fish food input!
Cool project with the Kokanee eggs! Good luck (I know you've got the diligence part nailed)!