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Like cattle pens, the salmon operations bring product to market cheaply. But harm to ocean life and possibly human health has experts worried. Fish farming is booming. But now, the hidden costs of mass-producing these once wild fish are coming into focus. Begun in Norway in the late 1960s, salmon farming has spread rapidly to cold-water inlets around the globe. Industrial fish farming raises many of the same concerns about chemicals and pollutants that are associated with feedlot cattle and factory chicken farms. Recently, the prospect of genetically modified salmon that can grow six times faster than normal fish has heightened anxiety.