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Combined Fish-Vegetable Farming Catching On

The fish don’t like strangers. Ellen Perlman pours a scoop of fish food into one of four blue plastic tanks at Chesapeake Aquaponics, about half an hour from Baltimore. Picture a giant kiddie pool that's deep enough to stand in up to your belly. “You would think we have piranhas here,” she said, expecting a torrent of tilapia to froth the water’s surface but it remains stubbornly smooth. She chuckled. "Maybe not.”  She says the fish recognize her voice and her...

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