Bruce Rauner, Governor

DNR Links Skip to Content Skip to State Links

 IDNR Home
 Agency Offices
 Disabled Outdoors
 Freedom of Information Act
 Get Involved
 Grant Info
 Great Lakes Restoration
 License / Permit / Register
 Kids & Education
 Law Enforcement
 Mandatory Safety Programs
 Lodges / Leasing
 More Links
 Outdoor Recreation
 Parks & Recreation
 Press Releases
 State Museums
 World Shooting & Recreational Complex
 DNR A to Z


  Rainbow trout  

Department of Natural Resources

Illinois Exotic Species:
rainbow trout Oncorhynchus mykiss

The average life span of a rainbow trout is six years. Its average weight is one pound in streams and five pounds in Lake Michigan, and it has an average length of 10 to 15 inches. The back of this fish is olive green, the sides are silvery with a pink stripe and the belly is silvery. Spots are present on the back, dorsal fin and caudal fin. The tail is forked. The adipose fin has a black edge.

It reaches maturity at age three. Spawning occurs in spring. The female deposits 500 to 9,000 eggs which are buried in gravel. Eggs hatch in 30 to 100 days. The rainbow trout eats insects, snails and small fishes. Native to the Pacific coast of North America, the rainbow trout lives in Lake Michigan and is stocked in many lakes and streams throughout Illinois.

Exotic Species Photo Gallery | Exotic Species Intro Page | Wild About Animals | Wild About Plants

Kids & Education

 New This Month
 Online Order Form
 Student Pages

Copyrightę 2015 Department of Natural Resources
Accessibility    Contact    FAQs    Podcasts    Privacy    Social Networking