River Colne
23 fish species have been recorded at 37 locations along the River Colne.
Records updated10 August 2026Most recent survey: 2026
- Fish species
- 23
- Places surveyed
- 37
- Survey visits
- 171
- Records span
- 1986–2026
Local EA evidence
Where fish were recorded
37 of 37 places shown
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 |
|---|---|---|---|---|---|
| ChubLeuciscus cephalus | 34 | 2026 | 3,328 | Median: 17.2 cm3,328 fish measuredLargest measured chub: 58.1 cm | Median: 1 lb 1.5 oz (0.496 kg)239 fish weighedLargest measured: 3 lb 9.4 oz (1.63 kg) |
| PerchPerca fluviatilis | 34 | 2026 | 3,124 | Median: 10 cm3,124 fish measuredLargest measured perch: 39.9 cm | Median: 1.7 oz (0.048 kg)373 fish weighedLargest measured: 14.6 oz (0.413 kg) |
| RoachRutilus rutilus | 32 | 2026 | 9,804 | Median: 10.6 cm8,434 fish measuredLargest measured roach: 34.2 cm | Median: 2.3 oz (0.066 kg)559 fish weighedLargest measured: 1 lb 8.4 oz (0.692 kg) |
| PikeEsox lucius | 30 | 2026 | 620 | Median: 33 cm620 fish measuredLargest measured pike: 91.4 cm | Median: 3 lb 4.3 oz (1.48 kg)34 fish weighedLargest measured: 10 lb 1.4 oz (4.58 kg) |
| DaceLeuciscus leuciscus | 29 | 2026 | 2,768 | Median: 14.2 cm2,768 fish measuredLargest measured dace: 31 cm | Median: 1.6 oz (0.0445 kg)630 fish weighedLargest measured: 1 lb 12.6 oz (0.81 kg) |
| GudgeonGobio gobio | 29 | 2026 | 3,009 | Median: 10 cm3,009 fish measuredLargest measured gudgeon: 18.9 cm | Median: 0.9 oz (0.026 kg)342 fish weighedLargest measured: 10.1 oz (0.287 kg) |
| BullheadCottus gobio | 25 | 2026 | 685 | Median: 6.6 cm463 fish measuredLargest measured bullhead: 9.8 cm | Median: 0.3 oz (0.0074 kg)100 fish weighedLargest measured: 2.4 oz (0.068 kg) |
| European eelAnguilla anguilla | 24 | 2026 | 330 | Median: 55.5 cm330 fish measuredLargest measured european eel: 92 cm | Median: 8.4 oz (0.237 kg)158 fish weighedLargest measured: 4 lb 1.3 oz (1.85 kg) |
| MinnowPhoxinus phoxinus | 16 | 2026 | 5,787 | Median: 5.5 cm256 fish measuredLargest measured minnow: 10.5 cm | — |
| Common breamAbramis brama | 16 | 2026 | 474 | Median: 8.4 cm474 fish measuredLargest measured common bream: 53.8 cm | Median: 1.4 oz (0.0388 kg)22 fish weighedLargest measured: 3 lb 11.5 oz (1.69 kg) |
| BleakAlburnus alburnus | 15 | 2024 | 2,181 | Median: 9.5 cm2,181 fish measuredLargest measured bleak: 19.4 cm | Median: 0.3 oz (0.0079 kg)79 fish weighedLargest measured: 2.8 oz (0.08 kg) |
| BarbelBarbus barbus | 12 | 2026 | 390 | Median: 39.1 cm390 fish measuredLargest measured barbel: 76.5 cm | Median: 1 lb 11.5 oz (0.781 kg)20 fish weighedLargest measured: 7 lb 9.7 oz (3.45 kg) |
| Stone loachBarbatula barbatula | 11 | 2026 | 14 | Median: 7.9 cm10 fish measuredLargest measured stone loach: 9.3 cm | Recorded weight: 0.2 oz (0.0062 kg)1 fish weighed |
| Brown / sea troutSalmo trutta | 10 | 2026 | 88 | Median: 27.3 cm88 fish measuredLargest measured brown / sea trout: 67 cm | Median: 8.5 oz (0.24 kg)9 fish weighedLargest measured: 5 lb 5.7 oz (2.43 kg) |
| TenchTinca tinca | 8 | 2025 | 62 | Median: 14.8 cm62 fish measuredLargest measured tench: 39 cm | Median: 7 oz (0.199 kg)7 fish weighedLargest measured: 1 lb 15.1 oz (0.883 kg) |
| 3-spined sticklebackGasterosteus aculeatus | 8 | 2025 | 124 | Median: 2.8 cm19 fish measuredLargest measured 3-spined stickleback: 5.1 cm | — |
| Common carpCyprinus carpio | 4 | 2024 | 12 | Median: 54 cm12 fish measuredLargest measured common carp: 68 cm | — |
| RuffeGymnocephalus cernuus | 4 | 2022 | 31 | Median: 10 cm31 fish measuredLargest measured ruffe: 13.4 cm | Median: 0.6 oz (0.018 kg)6 fish weighedLargest measured: 1 oz (0.0271 kg) |
| Silver breamAbramis bjoerkna | 4 | 2024 | 7 | Median: 8.8 cm7 fish measuredLargest measured silver bream: 18 cm | — |
| GraylingThymallus thymallus | 2 | 2009 | 42 | Median: 24 cm42 fish measuredLargest measured grayling: 30.3 cm | Median: 5.5 oz (0.157 kg)25 fish weighedLargest measured: 11.1 oz (0.314 kg) |
| 10-spined sticklebackPungitius pungitius | 1 | 2026 | 4 | Median: 4.7 cm4 fish measuredLargest measured 10-spined stickleback: 5.4 cm | — |
| Brook lampreyLampetra planeri | 1 | 2012 | 1 | Recorded length: 15 cm1 fish measured | — |
| RuddScardinius erythrophthalmus | 1 | 2012 | 3 | Median: 9.9 cm3 fish measuredLargest measured rudd: 10.1 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.
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