A Mexican federal official told The Associated Press that Zambada and Guzmán López arrived in the United States on a private plane and turned themselves in to authorities.
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.
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.