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“If they can grow to adulthood faster, they’re going to theoretically survive predation better and contribute at a higher rate to the population,” says Mike Pillow, a biologist with the wildlife service in Arizona. “We look at translocation as a head start.”
The government also tweaked operations at Glen Canyon Dam. Beginning in 1996, the Bureau of Reclamation, the agency that manages the dam, began to unleash sporadic “high flow experiments”—pulses of water intended to mimic historic floods. The sudden flows, and the sediment they deposited, were intended to build more camping beaches for rafters. But chub also may have benefited from the protection provided by new sandbars and backwaters.
Perhaps the biggest boost came from an unexpected ally: climate change. Since 2000, the Colorado River has been stricken by drought, a climate-fueled disaster that has cut flows by nearly 20 percent—and, luckily for chub, warmed the water from Lake Powell. What’s more, Lake Mead, the reservoir behind Hoover Dam, has shriveled to just 34 percent of its capacity. Chub have taken advantage of reemerging sandbars and eddies, and exposed rapids have blocked invasive predators from swimming upstream, creating a refuge for native fish.
Though the chub’s…