The sky is just beginning to lighten over Lake Victoria and the hacking of machetes echoes along the Kenyan coastline. Fishermen, stripped to their underwear in the already rising heat, are chasing silvery baby fish through the thick grass that chokes the lake shores, in defiance of laws against fishing in these delicate breeding grounds.

"I've seen the water recede, and even now it continues to go down" says Idi Obiero, one of hundreds of Kenyan fisherman that have recently been arrested for following catches into Ugandan waters. "When the water goes down here, we have to follow the fish into the deeper waters. That's the only way you can get enough fish to feed your family."

Water levels in Lake Victoria, the world's largest tropical lake and a major feature of East Africa's landscape and economy, have fallen by as much as six feet since 2003. Climbing temperatures, invasive species, international hydroelectric projects and millions of poor fishermen all play a part in the environmental crisis that threatens to add Lake Victoria to the growing list of the world's dying lakes.

Video by Alex Stonehill and Sarah Stuteville, produced in association with the Pulitzer Center On Crisis Reporting for PBS's Foreign Exchange with Daljit Dhaliwal.

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