Can survive in water with very low oxygen concentrations. Water body must not freeze solid. In streams, juveniles more apt to be found in deep pools. During winter mudpuppies are found in waters with slow to moderate current, often near outlets. Design Criteria Vegetation Prefers some submergent vegetation but this is likely more important for juveniles.
Females lay eggs on underside of such shelters.
Nests generally under rocks on sandy bottoms. Adults can be found in large deep lakes or shallow, muddy streams. Adults may be taken by large pike or walleyes, water snakes, or possibly birds such as great blue herons. Eggs and juveniles are likely more prone to predation from a variety of sources. References Bishop, S. C. 1941.