Fish Removal Reshapes River: Experiment slashed trout, lifted native chub; impact still unclear
Scientists removed invasive fish from the Colorado River to help native species.
This four-year experiment significantly altered the river's fish population composition.
Rainbow trout numbers dropped dramatically, while native fish showed some signs of recovery.
However, other environmental factors complicated the assessment of the program's success.
Ongoing efforts continue to protect the Grand Canyon's native fish populations.
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