I've been spending much of the last couple of weeks doing radio and other media for my aquaculture cover in TIME. Everyone wants to know the same thing: is fish farming really sustainable? "It depends" isn't a very satisfactory answer, so I've been focusing on the efforts of some in the aquaculture industry to raise fish more efficiently and more sustainably. It's not easy, but some—like Australis Aquaculture—are getting there.
The biggest obstacle to farming fish right, however, isn't the pollution a farm might create, or the risk of disease spreading from farmed fish to their wild cousins. It's the simple fact that to raise most fish—at least the kind of fish we like to eat—we need to catch fish as well. Farmed salmon and other popular species need fishmeal in their diet, and that food comes from small forage fish like anchovies that are caught in the wild.
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