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- Water quality biological assessment25
- Water quality9
- Environmental aspects4
- Fishes3
- Indicators (Biology)3
- Water3
- Water quality management3
- Effect of water quality on2
- Environmental monitoring2
- Habitat2
- Pollution2
- Stream ecology2
- Basins (Geology)1
- Benthos1
- Dissolved oxygen1
- Drinking water1
- Effect of human beings on1
- Effect of pollution on1
- Eutrophication1
- Fertilization1