A few years ago, while buying some fish for dinner, I shied away from wild salmon in favor of farm-raised. It sounded like a good way to lessen my footprint on nature, and wild salmon are rather scarce in New England rivers. Now I know better. In our local estuary, Cobscook Bay, one of that nation’s largest aquaculture companies, Cooke Aquaculture, has proposed expanding its fish-farming operations. This, of course, means feeding fish, mainly salmon, in pens suspended in the waters of the estuary.