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Sorting, removing Asian carp

A chute-like steeppass fish-sorting system is being tested at Emiquon preserve near Lewistown, May 17, 2021, as officials work to keep invasive carp out of the Great Lakes.

Asian carp leap near the fish sorting machine at Emiquon preserve near Lewistown, May 17, 2021. (Antonio Perez / Chicago Tribune)

Many hoses connect to the side of the steeppass fish-sorting system at the Emiquon preserve near Lewistown, May 17, 2021.

Many hoses connect to the side of the steeppass fish-sorting system at the Emiquon preserve near Lewistown, May 17, 2021. (Antonio Perez / Chicago Tribune)

Nora Hargett, left, and Stephanie Schmidt, graduate students from the University of Illinois, boat near leaping Asian carp near the fish sorting system being tested near Lewistown.

Nora Hargett, left, and Stephanie Schmidt, graduate students from the University of Illinois, boat near leaping Asian carp near the fish sorting system being tested near Lewistown. (Antonio Perez / Chicago Tribune)

The fish sorting system is part of this structure at Emiquon preserve near Lewistown.

The fish sorting system is part of this structure at Emiquon preserve near Lewistown. (Antonio Perez / Chicago Tribune)

Doug Blodgett, the Nature Conservancy’s director of river conservation, watches Asian carp at the Emiquon Nature Preserve in Lewistown.

Doug Blodgett, the Nature Conservancy’s director of river conservation, watches Asian carp at the Emiquon Nature Preserve in Lewistown. (Antonio Perez / Chicago Tribune)

Doug Blodgett, the Nature Conservancy’s director of river conservation, looks toward the Illinois River while standing atop structure being tested to sort Asian carp.

Doug Blodgett, the Nature Conservancy’s director of river conservation, looks toward the Illinois River while standing atop structure being tested to sort Asian carp. (Antonio Perez / Chicago Tribune)

The chute-like structure, called a steeppass, at the Emiquon preserve near Lewistown.

The chute-like structure, called a steeppass, at the Emiquon preserve near Lewistown. (Antonio Perez / Chicago Tribune)

The chute-like structure called a steeppass, at Emiquon preserve. The technology comes from Whooshh Innovations.

The chute-like structure called a steeppass, at Emiquon preserve. The technology comes from Whooshh Innovations. (Antonio Perez / Chicago Tribune)

Asian carp leap near the steeppass.

Asian carp leap near the steeppass. (Antonio Perez / Chicago Tribune)

A speaker for use in the steeppass being tested at the Emiquon preserve near Lewistown.

A speaker for use in the steeppass being tested at the Emiquon preserve near Lewistown. (Antonio Perez / Chicago Tribune)

The structure leads toward the steeppass being tested near Lewistown.

The structure leads toward the steeppass being tested near Lewistown. (Antonio Perez / Chicago Tribune)

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