River and Stream Ecosystems: Michigan has more than 35,000 miles of rivers and streams. Together with our lakes and groundwater, Michigan has abundant freshwater for farming, industry, recreation, and home use. The waterways also provide habitat for wildlife, including sport and commercial fish. Explore how streams and rivers are formed, and the fish and wildlife that depend on them. Then, learn about Michigan’s largest fish, the Lake Sturgeon, why it is threatened, and what can be done to help protect it. Supports Ecosystems & Biodiversity Unit lessons 1, 8 and 10; and Water Quality Unit Lesson 7.