On a Hong Kong Rooftop, an Urban Fish Farm

There are about 80,000 tons of water sitting on the 15th floor of an industrial building.

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Wild fish are becoming alarmingly scarce in much of the world, not least in Asia, where overwhelming demand has led to extensive over-fishing. Now, entrepreneurs are investing in fish farming. One fish farm, Ocean Ethix, is operating an environmentally friendly facility in a Hong Kong high-rise.