From Growing Power's urban aquaponics to India's expansion of aquaculture, TreeHugger has offered many posts on ways to make fish farming both more sustainable and more productive. But some of the best ideas may be the oldest. Geoff Lawton—the man behind the amazing-looking Permaculture Soils DVD, as well as the famous Greening the Desert permaculture garden in Jordan—has written a great overview of traditional Chinese salt water pond fish farming:
"The gate is designed to allow the water to still flow in and out with the tides, through screened pipes that keep the prawns inside. The prawns will then grow out, eating natural feed, in their natural tidal mangrove environment. [...] This is a wonderful system that allows harvest of wild life cycles using enhanced natural habitat landscape of nature for productivity."