To be more precise, the DFO study estimate was that it took 18 full-time people to run a closed containment farm, versus 10 for a net pen. I thought the numbers would be closer together, actually, but when I've talked to anybody who's in the net-pen industry they've told me that, yes, it does take more to run a closed containment farm.
On November 17th, 2011. See this statement in context.