Macroinvertebrates are animals that have no backbone and are visible without magnification. Stream-bottom macroinvertebrates include such animals as crayfish, mussels, aquatic snails, aquatic worms, and the larvae of aquatic insects.

Table of Contents

1. Why study the stream-bottom macroinvertebrates?

2. Identification of stream-bottom macroinvertebrates.
   • IDENTIFICATION KEY for common stream-bottom macroinvertebrates.

   • Catalog of common stream-bottom macroinvertebrates.
     • Macroinvertebrates that are very sensitive to pollution.
       
     • Macroinvertebrates that are somewhat sensitive to pollution.
       
     • Macroinvertebrates that are tolerant of pollution.

   • Practice samples.

3. Collection and interpretation of data.
   • Sampling materials and equipment.
   • Sample collection procedures.
   • The Sample Record and Assessment Form.

4. Glossary of terms used in the Stream Study.

5. Additional information sources.    (Includes credits for content and graphic material)

6. The Stream Study development team.

7. The Save Our Streams Program.