Experts have said that invasive carp is continuing to spread north wards in the Mississippi River even as authorities try to control its spread.

The Minnesota Department of Natural Resources has said that commercial fishermen caught two adult invasive carp in Pool 2 in Cottage Grove on Thursday. One of them was a bighead carp that weighed about 40 pounds while the other was a silver carp, which leap from water when they are disturbed. The second one weighs about 20 pounds.

Commercial fisherman under contract with the state Department of Natural Resources after capturing the two carps in Pool 2 of the river. Regional fisheries manager Brad Parsons said the discovery is “disappointing but not entirely unexpected.”

Experts said that bighead carp were never found above the mouth of the St. Croix River near Prescott, Wis. Silver carp had not been detected above Pool 5A near Winona. Both the carp found by the fishermen were females that contained eggs, which has raised concerns over their spread in the area.

The Minnesota Department of Natural Resources is working to control the spread of invasive carp through sampling efforts in order to determine if more or smaller invasive carp are in the area.