By Megan Gannon, News Editor | March 12, 2014 04:37pm ET
Invasive, plankton-slurping Asian carp are creeping up the Mississippi River.
Ready-to-hatch carp eggs were discovered as far north as Lynxville, Wisc., some 250 miles (400 kilometers) farther upstream than the northernmost known breeding population of the species, the U.S. Geological Survey said today (March 12).
Asian carp have voracious appetites and high reproduction rates. Some species of the fish can grow up to 100 pounds (45 kilograms) and scarf down 5 to 10 percent of their body weight in plankton in a single day. Four kinds of Asian carp – grass, bighead, silver and black — can now be found in U.S. waterways and they have a tendency to out-compete native fish.
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