NEW ORLEANS -- It's being hailed as the solution to America's dependence on imported seafood: industrial-scale fish farms in the open ocean, capable of putting red snapper and grouper on every dinner table in the country. Still a fledgling industry in the United States, and globally, deepwater marine farming brings small fish born in laboratories to immense underwater cages in the ocean. There they are fed, grown to a marketable size, harvested and brought back to shore for sale. After more than a decade of research, though, only a handful of operations exist in the United States, largely...
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