In 2018, scientists began removing about 285,000 fish from Wisconsin's McDermott Lake; 4 years later yellow perch were up 788%, but walleye recruitment was still zero

• Both McDermott Lake and Sandy Beach Lake had previously supported natural walleye recruitment.
• Scientists removed about 285,000 warm-water fish from a Wisconsin lake over four years in an attempt to help its declining walleye population recover.
• The large-scale experiment reduced several fish species and was followed by a sharp rise in yellow perch.