River Colne
19 fish species have been recorded at 33 locations along the River Colne.
- Fish species
- 19
- Places surveyed
- 33
- Survey visits
- 347
- Records span
- 1984–2026
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 |
|---|---|---|---|---|---|
| RoachRutilus rutilus | 31 | 2026 | 29,013 | Median: 11.6 cm29,013 fish measuredLargest measured roach: 35.1 cm | — |
| European eelAnguilla anguilla | 31 | 2026 | 5,521 | Median: 39.5 cm1,605 fish measuredLargest measured european eel: 92.6 cm | Median: 3.5 oz (0.099 kg)1,603 fish weighedLargest measured: 4 lb 0.4 oz (1.83 kg) |
| GudgeonGobio gobio | 30 | 2026 | 8,453 | Median: 9.3 cm8,129 fish measuredLargest measured gudgeon: 18.8 cm | — |
| DaceLeuciscus leuciscus | 30 | 2026 | 9,856 | Median: 13.4 cm9,814 fish measuredLargest measured dace: 33.5 cm | — |
| PikeEsox lucius | 29 | 2026 | 2,912 | Median: 33.2 cm2,912 fish measuredLargest measured pike: 101 cm | — |
| PerchPerca fluviatilis | 29 | 2026 | 2,935 | Median: 12.5 cm2,935 fish measuredLargest measured perch: 40.1 cm | — |
| Stone loachBarbatula barbatula | 28 | 2026 | 1,345 | Median: 8.2 cm1,345 fish measuredLargest measured stone loach: 13.5 cm | — |
| ChubLeuciscus cephalus | 27 | 2026 | 5,510 | Median: 21.3 cm5,510 fish measuredLargest measured chub: 51.5 cm | — |
| Common breamAbramis brama | 27 | 2023 | 1,395 | Median: 31.5 cm1,395 fish measuredLargest measured common bream: 70.5 cm | — |
| 3-spined sticklebackGasterosteus aculeatus | 26 | 2026 | 1,016 | Median: 4.2 cm1,016 fish measuredLargest measured 3-spined stickleback: 7.5 cm | — |
| BullheadCottus gobio | 23 | 2026 | 1,229 | Median: 6.3 cm1,229 fish measuredLargest measured bullhead: 9.9 cm | — |
| RuddScardinius erythrophthalmus | 22 | 2026 | 143 | Median: 11.6 cm143 fish measuredLargest measured rudd: 26.9 cm | — |
| MinnowPhoxinus phoxinus | 20 | 2026 | 4,010 | Median: 5.6 cm3,188 fish measuredLargest measured minnow: 9.7 cm | — |
| TenchTinca tinca | 15 | 2023 | 144 | Median: 29.1 cm144 fish measuredLargest measured tench: 49 cm | — |
| Common carpCyprinus carpio | 11 | 2006 | 59 | Median: 57.1 cm59 fish measuredLargest measured common carp: 73 cm | — |
| Brown / sea troutSalmo trutta | 4 | 2011 | 26 | Median: 38.5 cm26 fish measuredLargest measured brown / sea trout: 61.2 cm | — |
| 10-spined sticklebackPungitius pungitius | 4 | 2026 | 8 | Median: 4.2 cm8 fish measuredLargest measured 10-spined stickleback: 5 cm | — |
| Golden goldfishCarassius auratus | 3 | 2007 | 5 | Median: 27.9 cm5 fish measuredLargest measured golden goldfish: 31.5 cm | — |
| Crucian carpCarassius carassius | 3 | 1987 | 4 | Median: 23.7 cm4 fish measuredLargest measured crucian carp: 25.5 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 →