CORRECTS TO BIGHEAD CARP, NOT BIG HEADED CARP  - Ben Stahlschmidt, a fish biologist with the US Geological Survey, releases bighead carp into a holding tank on Tuesday, July 20, 2021, after pulling it from one of the ponds at the Columbia, Mo., facility. USGS and University of Missouri researchers received a $200k grant to study how invasive carp eggs move through rivers. This could pave the way for better control of these fish, as they are currently spreading throughout Missouri and the Midwest causing ecological and economic damage. (Christian Gooden/St. Louis Post-Dispatch via AP)