Once populous throughout the Colorado River and Grand Canyon, a fish known as the humpback chub began declining in numbers throughout the 1990’s. But now, after 13 years of restoration activity, it appears efforts to save the fish are no longer swimming upstream. This, according to Environment and Energy’s Land Letter, which reports that experimental water releases from the Glen Canyon Dam that mimic historic changes in river flow, coupled with efforts to control competing non-native fish species, have resulted in a 50 percent increase in humpback chub numbers over the past six years. With the chub population climbing to around 10,000 strong, it may not be long before this rare fish is let off the endangered species hook.