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Aquaponics is a blend of aquaculture -- fish farming -- and hydroponics, growing plants without soil in water. The idea is to grow fish in a tub or pool, using the nutrient-rich fish waste to fertilize vegetables and herbs grown hydroponically.
It is a nearly closed-loop system. The water from the fish tank, containing all the nutrients needed for plant growth, is pumped or diverted by gravity to the hydroponically grown plants. The plants filter ammonia and other fish waste products out of the water, which is then recirculated back to the fish. The only inputs required are food for the fish and small amounts of water to replenish what is lost through evaporation from the tank and transpiration through plant leaves.
McDonald's to Serve Sustainable Fish in Europe
McDonald's, the world's biggest fast-food company, said Wednesday that it had reached a deal under which a nonprofit organization would certify as sustainable the catch used for each of the 100 million fish sandwiches the chain sells in Europe every year.
Threat to Freshwater Species - The single biggest threat to fresh water species is pollution from thousands of factories, cities that pour pesticides, fertilizers and herbicides (including nitrates and phosphates), medical waste and radioactive waste -
Invasive species threat to freshwater species - Another threat to freshwater species and lakes and rivers than sustain them is the introduction of non-native or "exotic" species into an aquatic habitat. They can do a lot of damage -
Seafood watch - Which species can we grill without cares, and which seafood are ecological no-nos? -