According to the Minnesota Department of Natural Resources in an email to the Minnesota Stop Carp Coalition:
A bighead carp was captured on Tuesday, September 16 at the mouth of the St. Croix River by a commercial angler under DNR contract. The fish was 901 mm long and weighed 21 lbs 5 oz.
Because a bighead carp had previously been found in the area, the DNR is not issuing a press release. The fish caught this week is not a silver carp, the species notorious for leaping out of the water when boats pass, and which was found in the Mississippi near the St. Croix earlier this summer, but the DNR says their impacts can be severe:
They eat huge amounts of plankton and detritus. Because they feed on plankton, these fish compete for food with native organisms including mussels, larval fishes, and some adult fish such as paddlefish. This competition for food could result in fewer and smaller sport fish.