Dark Blue = Counties with designated critical habitat
Light Blue = Historical records
Comments: The sturgeon chub is well-adapted to large, turbid rivers like the Missouri.
These adaptations include small eyes and external sensory bumps (papillae) that help it
locate food. A ventrally located mouth is welladapted for taking invertebrates off the
river bed. A short gut reflects this staple diet of mostly aquatic insects that are easily
digestible. The sturgeon chubs original range was reduced by nearly half due to
changes in the Missouri River. This chub is relatively short-lived (4 years) and does not
reproduce until it reaches its second year. These fish are rarely seen or reported.