Research and analysis
B7b: Classification of fish in English rivers, 2009 to 2022
Updated 1 December 2025
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| year | classification | percentage |
|---|---|---|
| 2009 | Bad | 1.483541956 |
| 2010 | Bad | 1.996450754 |
| 2011 | Bad | 1.334481274 |
| 2012 | Bad | 1.342281879 |
| 2013 | Bad | 0.691056911 |
| 2014 | Bad | 0.715421304 |
| 2015 C1 | Bad | 0.701480904 |
| 2015 C2 | Bad | 6.507592191 |
| 2016 | Bad | 6.44316396 |
| 2019 | Bad | 6.573705179 |
| 2022 | Bad | 6.0 |
| 2009 | Poor | 24.38572091 |
| 2010 | Poor | 23.02573203 |
| 2011 | Poor | 21.35170039 |
| 2012 | Poor | 20.63758389 |
| 2013 | Poor | 20.04065041 |
| 2014 | Poor | 18.75993641 |
| 2015 C1 | Poor | 18.47233048 |
| 2015 C2 | Poor | 24.72885033 |
| 2016 | Poor | 24.67260346 |
| 2019 | Poor | 24.15338645 |
| 2022 | Poor | 24.0 |
| 2009 | Moderate | 32.35975892 |
| 2010 | Moderate | 31.14463177 |
| 2011 | Moderate | 28.88506242 |
| 2012 | Moderate | 28.48154362 |
| 2013 | Moderate | 30.81300813 |
| 2014 | Moderate | 32.07472178 |
| 2015 C1 | Moderate | 32.77474669 |
| 2015 C2 | Moderate | 26.78958785 |
| 2016 | Moderate | 27.44892614 |
| 2019 | Moderate | 27.63944223 |
| 2022 | Moderate | 27.0 |
| 2009 | Good | 32.54520167 |
| 2010 | Good | 32.91925466 |
| 2011 | Good | 35.51442101 |
| 2012 | Good | 35.69630872 |
| 2013 | Good | 36.38211382 |
| 2014 | Good | 36.52623211 |
| 2015 C1 | Good | 35.26890101 |
| 2015 C2 | Good | 27.54880694 |
| 2016 | Good | 26.66317444 |
| 2019 | Good | 26.4940239 |
| 2022 | Good | 27.0 |
| 2009 | High | 9.225776541 |
| 2010 | High | 10.91393079 |
| 2011 | High | 12.91433491 |
| 2012 | High | 13.84228188 |
| 2013 | High | 12.07317073 |
| 2014 | High | 11.92368839 |
| 2015 C1 | High | 12.78254092 |
| 2015 C2 | High | 14.42516269 |
| 2016 | High | 14.77213201 |
| 2019 | High | 15.13944223 |
| 2022 | High | 16.0 |