Grand Canyon experiment cuts rainbow trout below 10% to aid native fish

Scientists conducted a four-year removal program targeting non-native fish in the Colorado River within the Grand Canyon. The initiative led to a dramatic decline in rainbow trout, whose share of the river's fish population fell below 10%. Native fish species showed some signs of recovery as a result of the intervention. However, other environmental factors made it difficult to fully evaluate the program's overall success. Conservation efforts to protect the Grand Canyon's native fish populations are ongoing.