It is the latest move in a battle to keep non-native smallmouth bass and green sunfish at bay in an area of the Colorado River below the Glen Canyon Dam.
Also on Arizona Spotlight: How art can help with in-hospital healing; Luis Alberto Urrea on how his literature career began; and "Stories That Soar!" considers the meaning of love.
Park officials said that during the summer, temperatures on exposed parts of the trail can reach over 120 degrees Fahrenheit (49 degrees Celsius) in the shade.
AZPM is a service of the University of Arizona and our broadcast stations are licensed to the Arizona Board of Regents who hold the trademarks for Arizona Public Media and AZPM. We respectfully acknowledge the University of Arizona is on the land and territories of Indigenous peoples.