The unaltered stomach contents of a dead albatross chick photographed on Midway Atoll National Wildlife Refuge in the Pacific in September 2009 include plastic marine debris fed the chick by its parents. (Chris Jordan)

Open pen aquaculture has suffered a great many criticisms these past few decades, but the most damning of all was shared with me only recently by a thoughtful New Brunswick marine biologist. As she explained it, the reason open-pen aquaculture remains so profitable, is because it’s not paying all its bills. These pens, stuffed with…

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Zack Metcalfe