1. Approach the sample site from the downstream end.
 |
4. Disturb the substrate thoroughly with your feet.
 |
Figure 4.9
Procedures for collecting a macroinvertebrate sample in a rocky-bottom stream
Volunteers must follow set protocol to collect an unbiased sample. |
2. Position the net at a 45° angle with the bottom
tight against the substrate.
 |
5. Remove the net with a forward scooping motion.
 |
3. Dislodge macroinvertebrates by rubbing rocks
thoroughly.
 |
6. Flush out the net with clean stream water.
 |
