sentences:  For example, a 2006 report on 83 habitat areas in the Yampa River, which sampled 14,140 fish, reported only 1.6% of that total (221 fish) were native.It also noted that 86% of these native fishes were taken in isolated pools where few or no smallmouth bass occurred; only 32 native fish were captured in the mainstem, where nonnative predatory species occur, considered an indication of the negative impact of non-native fish.A 2006 report on the middle Green River, following removal of large predatory nonnatives (pike and bass), suggested a small recent (2005–2006) increase in small nonnative cyprinids, but no increases in native species.