River Colne
6 fish species have been recorded at 11 locations along the River Colne.
- Fish species
- 6
- Places surveyed
- 11
- Survey visits
- 38
- Records span
- 2003–2025
Local EA evidence
Where fish were recorded
Choose a point on the map to see what was recorded there.
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River conditions
Environment Agency evidence
Fish found in this river
Open a linked fish for detailed measurements, or use the map filter above to compare survey locations.
| Fish | Sites | Most recent | Fish counted | Measured length | Measured weight |
|---|---|---|---|---|---|
| Brown / sea troutSalmo trutta | 10 | 2025 | 1,261 | Median: 10.6 cm1,178 fish measuredLargest measured brown / sea trout: 39.9 cm | — |
| Stone loachBarbatula barbatula | 8 | 2025 | 656 | Median: 8.6 cm559 fish measuredLargest measured stone loach: 12.6 cm | — |
| GraylingThymallus thymallus | 7 | 2025 | 164 | Median: 11.7 cm161 fish measuredLargest measured grayling: 32.2 cm | — |
| 3-spined sticklebackGasterosteus aculeatus | 5 | 2023 | 30 | Median: 3.5 cm29 fish measuredLargest measured 3-spined stickleback: 6.5 cm | — |
| MinnowPhoxinus phoxinus | 3 | 2021 | 171 | Median: 6.1 cm148 fish measuredLargest measured minnow: 9.5 cm | — |
| BullheadCottus gobio | 2 | 2025 | 49 | Median: 4.6 cm49 fish measuredLargest measured bullhead: 8.5 cm | — |
EA surveys have recorded these fish at particular sites and times. Absence from a survey is not evidence that a species is absent from the river. Every valid individual length and weight is retained, with its sample size shown.
Useful context
This page follows survey locations along the main River Colne. Tributaries and unrelated rivers with similar names are kept separate.
The map shows past fish records, not fishing access or a promise of what you’ll catch today.
How RiverFish handles the data →