Photo: Alien "Water Weed" in Africa Choking Lakes, Killing Fis



Fishing boats sit abandoned on October 1, 2006, after water levels retreated in Lake Kyoga, Uganda. The boats are ringed by thick patches of water hyacinth.

In addition to drought, Kyoga and nearby Lake Victoria are experiencing a new outbreak of water hyacinth, a fast-growing plant considered a menace.

Although its lavender blossoms (inset) might look appealing, the hyacinth's thick leaves clog vital waterways. The plants also block sunlight and oxygen from reaching the water, killing fish and encouraging blooms of deadly green algae.

Boats photograph by Sean Bryan; water hyacinth photograph by George F. Mobley/NGS


NEWS FEEDS    After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed. After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed.

Get our news delivered directly to your desktop—free.
How to Use XML or RSS

ADVERTISEMENT

NATIONAL GEOGRAPHIC'S PHOTO OF THE DAY

50 Drives of a Lifetime

Listen to your favorite National Geographic news daily, anytime, anywhere from your mobile phone. No wires or syncing. Download Stitcher free today.