The lawsuit is centered on a controversial development near Moab but could impact development in other parts of the state.
The white Amur fish feast on weeds in the canal that might otherwise clog water intake equipment.
The seven Western states that depend on the Colorado River have missed a deadline for the second time to agree on a plan addressing record drought and water shortages.
Seven states appear to have failed to reach an agreement on how to split up the water from the Colorado River ahead of a deadline.
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