A fisher at Khone Falls in Laos holds a large Bagarius catfish.

His basket trap, known as a Lop in the Lao language, is also used to catch fish such as the pa se ee, a carp native to the area.

Scientists say the Khone Falls area supports at least 201 fish species, including many endemic or endangered species. It also supports one of the few remaining concentrations of freshwater dolphins still living in the Mekong.

• More Photos in the News
• Today's Top 15 Most Popular Stories
• Free Email Newsletter: "Focus on Photography"