Personnel from the Army Engineer Research and Development Center and Geological Survey watch as a 350-ton crane lowers the 105-foot-long weldment, or underwater Acoustic Deterrent System, into the lock approach of Lock 19 near Keokuk, Iowa, Feb. 3, 2021. Laboratory-tested sounds that proved to be irritating to invasive Asian carp will be broadcast underwater from the weldment as part of a study to evaluate fish behavior.

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