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Figure 7.
These mangroves, in the Trang River Estuary in Thailand, are under threat from upstream discharge
of wastewater, industrial facilities and unsustainable aqua culture practices – particularly commercial shrimp
farming. From 1975 to 1993, it is estimated that about half of Thailand’s mangroves along its 2,560 kilometer
coastline have been lost. The larger area of the Had Chao Mai Marine National Park, the Ta Libong Island Non-
Hunting Area and the Trang River Estuaries has been designated a Ramsar Wetland Site and supports over 200
bird species including many “Critically Endangered”, “Endangered”, “Vulnerable” and “Threatened” species
according to the IUCN Red List (IUCN, 2006).
In these two Landsat images shrimp farms appear as bluish purple squares located near the streams. Be-
tween the earlier image acquired in January, 1990 and the later image acquired approximately 11 years later
there is an explosion in shrimp farming throughout the estuary.