Photo of the Day
Each day, we highlight one extraordinary photograph from National Geographic. Check out more of our photos here.
Freshwater fish species
April 2, 2010 | Ouachita Madtom
This Month in Photo of the Day: Nature and Environment
The finger-length Ouachita madtom lives only in the Saline River in Arkansas.
—Noturus lachneri
See more photographs from the April 2010 National Geographic feature story "Silent Streams."
