Table 4.
Determination of ‘Habitat quality’
| Water qualitya | |||
|---|---|---|---|
| Good | Fair | Poor | |
| Physical habitat | |||
| Poor (little or no suitable habitat present) | 3 | 2 | 1 |
| Fair (sub-optimal habitat present) | 4 | 3 | 2 |
| Good (‘optimal’ habitat present) | 5 | 4 | 3 |
ae.g. chemical General Quality Assessment (GQA) grades A–B (good), C–D (fair), E–F (poor). Note that the metric refers to the habitat requirements of the life period of the target species that migrates into rivers (e.g. spawning habitat for adult Atlantic salmon and river lamprey, nursery habitat for juvenile European eel)