My letter in Fish Farm International made some waves, and I have got several invitations for talks about the topic. I have also asked for information in favor of RAS systems for salmon, but have not received any.
I would like to link to two good reports on the topic:
Oppdrettsteknologi & Konkurranseposisjon from NOFIMA (in Norwegian): rapport-32-2013-oppdrettsteknologi-og-konkurranseposisjon
Feasibility of Land-Based Closed-Containment Atlantic Salmon Operations in Nova Scotia from Gardner Pinfold: 3Aqua Report-3-2