The World's Most Important Fish - Tyson Roberts

Eels have an important job in China's rice paddy fields. Ichthyologist Dr. Tyson Roberts has studied the eels and their impact on the fields and he says that they are "stirrers", that mixes the soil and, by simple virtue of living and dying in the fields, they add important nutrients as well. Roberts says that these are some of the most important fish in the history of humanity for their ability to increase the yield of China's rice paddies.