Video: Environmentally friendly aquasystem (Reuters)

With very little water and no discharge, Israeli marine biologists say they have developed the world's first environmentally friendly aquaculture system, using enclosed tanks to raise organic fish anywhere in the world. Reuters investigates...Watch video here

What do you think?  Is environmentally sound aquaculture possible?  And how would you measure such a thing?

English: Fish cages in Velfjorden, Brønnøy, Norway. (Photo credit: Wikipedia)