Bamboo filter traps stand in the raging waters of the Sahong channel at Khone Falls in Laos.

The fishing contraptions force fish up angled bamboo ramps where they land at the fishers' feet.

"The way the fish is caught is totally in sync with the environment," said Hogan of the Megafishes Project.

"Water goes up and down according to the flood cycle, so the fishers have very specific, efficient, and elegant methods of fishing based on the season."

Conservationists warn that a proposed dam on the channel will devastate the fisheries there.

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