Natural Area Preservation


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Necturus maculosus maculosus

Natural History
Mudpuppies inhabit clean waters and tend to be nocturnal, remaining hidden beneath rocks & other objects. Primarily bottom-walkers, they move into shallow water in spring and fall, but seek deeper water in winter and summer. They are active throughout the year and feed on crayfish, crustaceans, insect larvae, worms, fish eggs, small fish, carrion, & other amphibians. To better cope with their environment, mudpuppies have sense organs in their skin, which detect motion and pressure changes.

Reproduction and Growth
Mating occurs in the fall when males and females form aggregations in shallow water. The male deposits a spermatophore and female picks it up and stores it until spring. Egg laying occurs in May or early June. Nest cavities are excavated under a rock, log, or board in ½ to 10ft of water. Twelve to over 100 eggs are laid over several days, and incubation takes one to two months, depending on water temperature. Sexual maturity takes 4-6 years and they can live in excess of 20 years.

This shy, misunderstood species is often persecuted because of appearance. In recent years the numbers have been reported to be declining in this area. This species is extremely vulnerable to pollutants and changes in water quality. It is also reportedly sensitive to certain chemicals used in Lamprey control.

Habitat Type

  • Ephemeral wetlands.
  • Agricultural areas.

​​​​Natural Area Preservation
3875 E. Huron River Dr.
Ann Arbor, MI 48104

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Remy Long​
  Deputy Manager
Tina Stephens
  Volunteer & Outreach Coordinator
Becky Hand
  Stewardship Specialist
Michael Hahn
  Stewardship Specialist