Invertebrates (bugs)

Periphyton (slime)

Invertebrates - Click on image for description.
Invertebrates are literally "animals without backbones" and they make up most of the animal life in streams, except fish. Most stream invertebrates are very small. They range from the larval (young) stages of insects to molluscs and worms.

Periphyton (Slimes) - Click on image for description