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.
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.