In her book Diet for a Small Planet, Frances Moore Lappe argued more than 35 years ago that grain-fed cattle were essentially “reverse protein factories” because they required many more pounds of plant protein to produce a pound of flesh. Now there’s a similar dynamic in the global fish farming, or aquaculture, industry — especially as it strains to satisfy consumers’ voracious appetite for top-of-the-food chain, carnivorous fish, such as salmon, tuna and shrimp.
