With compromised , overfished seas , David Barber puzzled over how to keep fish on food shelves . He says he visited fish farms in Spain that restored water flow , returning populations to wetlands . That river water eventually dumps into the Atlantic . The farm is ecologically balanced , with abundant fish and 250 bird species , he says . Barber : The farm 's ecosystem is healthy again -- and the fish it produces are delicious .
With compromised , overfished seas , David Barber puzzled over how to keep fish on food shelves . He says he visited fish farms in Spain that restored water flow , returning populations to wetlands . The farm is ecologically balanced , with abundant fish and 250 bird species , he says . Barber : The farm 's ecosystem is healthy again -- and the fish it produces are delicious .