Berlin start-up pioneers fish-farm veggie garden The ancient Aztecs and Chinese did it millenia ago, and now a Berlin start-up hopes it will feed 21st century city dwellers -- aquaponics, a combination of rearing fish and growing vegetables. The company ECF, short for Efficient City Farming, has set up shop inside the brick walls of an old brewery where it now grows tomatoes, peppers and greens, fertilised with fish excretions. IMAGES AND SOUNDBITES