sierraclub.org - sierra magazine - sept/oct 2011 - endangered-species - on the brink: animals fighting for survival
Photography by Joel Sartore | Captions by Della Watson
The yellowfin madtom is a type of small catfish native to the Tennessee River Valley, and today it can be found in only a handful of streams. Water pollution and habitat disruption have reduced the fish's population to approximately 8,300 individuals, 800 of which live in captivity. (Photographed at Conservation Fisheries Inc., Knoxville, Tennessee)