Vietnam’s Nha Trang River.
A row of turquoise dinghies floats in a harbor in Vietnam's Nha Trang River.
Vietnam's extensive coastline is rich with marine life, but overfishing there has brought 135 species of fish, shrimp, mollusk, and marine turtle to the brink of extinction.


Consumer advocates encourage diners to avoid Atlantic salmon because unhealthy farming of these fish releases waste, disease, and chemicals into the ocean.

 A 2006 study warned that overfishing and pollution could wipe out the world's seafood supply by 2048 if declines in marine species continue at current rates.


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