Five Asian bighead carp have been caught recently on the St. Croix River near Stillwater, the farthest north the invasive species has been found on the river, the Minnesota Department of Natural Resources reported Tuesday.

The fish were caught about seven miles upstream of the previous point where they had been confirmed.

The catch more than doubles the four bighead carp that had previously been caught in the river. One carp showed up in 1996 and three others were found in 2011.

The carp have been slowly migrating up the Mississippi River system after escaping from fish farms in southern states where they were used to keep pond water clean.

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