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Marybeth Brey, left, of the U.S. Geological Survey, teaches a student from Iowa State University how to tag a silver carp.
Will Budnick
/
USGS
Marybeth Brey, a research fish biologist with the Geological Survey and Christa Woodley, a research biologist with the Army Corps of Engineers, co-lead the project.They designed and installed a 16-speaker soundbar at Lock 19 in the Mississippi, a section of the river between Keokuk and Hamilton.