Looks like Soylent Green is our only hope, check this NYT article out.
China produces about 70 percent of the farmed fish in the world, harvested at thousands of giant factory-style farms that extend along the entire eastern seaboard of the country. Farmers mass-produce seafood just offshore, but mostly on land, and in lakes, ponds, rivers and reservoirs, or in huge rectangular fish ponds dug into the earth.
"They'll be a major supplier not just to the U.S., but to the world," said Richard Stavis, the chairman of Stavis Seafoods, an American company that imports Chinese catfish, tilapia and frog legs. China began emerging as a seafood power in the 1990s as rapid economic growth became the top priority in the country. But environmental experts say that headlong pursuit of higher gross domestic product has devastated Chinese water quality and endangered the country's food supply.
In Guangdong Province in southern China, fish contaminated with toxic chemicals like DDT are already creating health problems. "There are heavy metals, mercury and flame retardants in fish samples we've tested," said Ming Hung Wong, a professor of biology at Hong Kong Baptist University. "We've got to stop the pollutants entering the food system." More than half of the rivers in China are too polluted to serve as a source of drinking water. The biggest lakes in the country regularly succumb to harmful algal blooms. Seafood producers are part of the problem, environmental experts say. Enormous aquaculture farms concentrate fish waste, pesticides and veterinary drugs in their ponds and discharge the contaminated water into rivers, streams and coastal areas, often with no treatment.