Chilean farmed salmon has increased more than 10-fold in the past 15 years, but it is not without problems. The World Wildlife Fund reports that the production is taking a toll on the nation's inland lakes, where salmon smolts, or juvenile fish, are produced. Oxygen-free dead zones in the lakes are growing, fish are escaping and invading rivers and lakes and pollution is mounting. WWF estimates that switching production to contained ponds would would cost around $43 million -- just 2 percent of the money the country makes from salmon exports each year. This is just one of the criticisms of farmed salmon, which also rely heavily on stocks of wild fish to feed salmon, depleting wild species.