estimates of the decline are based on the fall in the number of fish caught. Some experts think there may be only a few hundred, or even fewer, adults left in the Mekong River. Overfishing is the ...

And though aquaculture is already widely practiced along the Mekong—in many houseboats a trapdoor leads to a watery pen of farmed fish—those fish are fed with smaller wild fish from the river.

Researchers discovered two new species of snake eels in Vietnam, one with "robust" teeth and one with "sharp" teeth.