The world’s oceans are running out of fish, and soon we’ll be beyond the point of no return – but human appetite for seafood isn’t going anywhere. That stark fact has led to ambitious efforts to farm fish in an environmentally friendly way instead of relying upon the stock in the sea, including a new system called Recirculating Marine Aquaculture.

This way of farming fish on land, developed by the UMBI Center of Marine Biotechnology in Maryland, relies on artificial sea water that is filtered and recycled after use. Methane from fish waste is captured to offset some of the energy required to raise the fish in captivity. Some of the fish that have been raised using the Recirculating Marine Aquaculture method include European seabass, striped bass and blue crabs.

"Green fish, as good as it gets”, says Yonathon Zohar, director of the Center of Marine Biotechnology at UMBI. “Clean, environmentally friendly, sushi-quality fish, delivered to the restaurant a few hours after harvesting."

The U.N. estimates that 75 to 80 percent of wild fish stocks are either already overfished or getting too close for comfort, and conventional methods of raising fish on land have their own problems. Aquaculture critics point out issues with water pollution from concentrated fish waste, as well as what is often seen as the unnecessary sacrifice of some types of fish to feed the farmed ones.

In addition to filtering and reusing the water used to raise the fish, UM researchers are developing new recipes for fish food made from plant material and algae instead of fish meal. Zohar also contends that higher water quality allows a greater concentration of fish per tank without disease or parasite problems, increasing yield.

So, how does fish raised this way stack up in terms of taste and texture? Chef Damon R. Hersh of Kali's Court and Mezze restaurants says he was “blown away” after a tour of the facility and a taste test.

"I'm very excited," said Hersh. "If this is the direction or wave of future aquaculture, then I'm all behind it."

New fish farming method provides virtually guilt-free seafood
Recirculating Marine Aquaculture filters and recycles water and uses methane from fish waste to offset energy use.