Wetlands are defined as areas of land saturated with water all year round and exhibiting the characteristics of a distinct ecosystem. In China, northwest of Hong Kong, is the Mai Po nature reserve (22°30′ N and 114°02 E′) (Cheung and Wong 2006). The entire Mai Po Nature Reserve (MPNR) covers approximately 2,700 hectares or approximately 6,700 acres. It is home to some of the most endangered waterbirds in the world. The wetlands are home to large numbers of migratory waterfowl each year. In the spring, thousands of migrating shorebirds stop to rest before continuing north toward their breeding grounds. They return to MPNR in the fall as they fly south toward their traditional wintering grounds. The MPNR also hosts more than 400 different species of insects, 90 species of invertebrates, and 50 different species of butterflies (Cheung and Wong 2006). The MPNR also plays an important role in Hong Kong's freshwater fish farming. Ponds were created (local name gei wai) in the 1920s and 1960s to harvest shrimp and fish. Gei wais are excellent examples of how wetlands can be managed sustainably (Wong 2003). Installation of a dike...