Open-ocean salmon farming practices have long been criticized as causing disease and pollution, but a new way of farming salmon inland has received attention as a step in the right direction toward sustainability, although the high cost of the inland method can be prohibitive. "In terms of environmental sustainability, I think [these closed-system farms are] a huge step forward," said Martin Krkosek, an assistant professor at the University of Toronto. "Waste material, disease, pollution, parasites -- all these things aren't a concern with most closed-system aquaculture."

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