In 2017, USGS injected 13.5 liters of red dye into Ohio’s Sandusky River during a grass carp spawning event; downstream stations measured dye movement

Researchers innovatively utilized red dye to trace the journey of grass carp eggs as they drift along the Sandusky River. By injecting the dye into the water, scientists could accurately assess flow patterns and egg displacement, identifying crucial spawning areas upstream of a dam. This groundbreaking methodology not only enhances understanding of these invasive species but also informs strategic actions for their removal.
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