It can take up to 5 pounds of wild fish to produce 1 pound of salmon

ScienceDaily (2009-09-08) -- Aquaculture, once a fledgling industry, now accounts for 50 percent of the fish consumed globally, according to a new report by an international team of researchers. And while the industry is more efficient than ever, it is also putting a significant strain on marine resources by consuming large amounts of feed made from wild fish harvested from the sea, the authors conclude.

http://www.sciencedaily.com/releases/2009/09/090907162320.htm

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