Scientists have confirmed for the first time that a species of the dreaded Asian carp has reproduced naturally in a Great Lakes tributary.

While not the variety of Asian carp experts fear will do the most harm in the Great Lakes region, the results have important implications for those concerned about the spread of this invasive species.

Four grass carp, a species of Asian carp, were caught by a commercial fisherman last year in the Sandusky River and analyzed by U.S. Geological Survey (USGS) scientists. They determined that the invasive fish were at least one year in age and had the capacity to become spawning adults.

Read the full story at National Geographic>>