 The fish's status as an endangered species has inspired a number of costly and controversial management measures, such as altering the operation of Glen Canyon Dam and removal of non-native predators.The humpback chub has a streamlined body, with a concave skull on its dorsum.The caudal peduncle is thin and somewhat pencil-like but not greatly elongated, where the length of the caudle peduncle divided by length of head is less than 1.0.