River Len
19 fish species have been recorded at 7 locations along the River Len.
- Fish species
- 19
- Places surveyed
- 7
- Survey visits
- 16
- Records span
- 2002–2023
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 |
|---|---|---|---|---|---|
| European eelAnguilla anguilla | 6 | 2023 | 86 | Median: 38.5 cm86 fish measuredLargest measured european eel: 94 cm | — |
| GudgeonGobio gobio | 6 | 2023 | 307 | Median: 9.8 cm288 fish measuredLargest measured gudgeon: 15.8 cm | — |
| PerchPerca fluviatilis | 4 | 2023 | 214 | Median: 10.2 cm214 fish measuredLargest measured perch: 29.3 cm | Median: 0.6 oz (0.018 kg)22 fish weighedLargest measured: 1.1 oz (0.032 kg) |
| PikeEsox lucius | 4 | 2023 | 50 | Median: 56.9 cm50 fish measuredLargest measured pike: 90.7 cm | — |
| RoachRutilus rutilus | 4 | 2023 | 2,847 | Median: 9.3 cm2,234 fish measuredLargest measured roach: 28.6 cm | Median: 1.4 oz (0.04 kg)61 fish weighedLargest measured: 7.1 oz (0.202 kg) |
| Common breamAbramis brama | 4 | 2023 | 126 | Median: 32.4 cm126 fish measuredLargest measured common bream: 49.7 cm | Median: 12.6 oz (0.358 kg)4 fish weighedLargest measured: 3 lb 13.1 oz (1.73 kg) |
| BullheadCottus gobio | 4 | 2023 | 44 | Median: 5.3 cm44 fish measuredLargest measured bullhead: 9 cm | — |
| ChubLeuciscus cephalus | 4 | 2023 | 33 | Median: 27.5 cm33 fish measuredLargest measured chub: 48 cm | — |
| Brown / sea troutSalmo trutta | 3 | 2017 | 62 | Median: 18.8 cm62 fish measuredLargest measured brown / sea trout: 34 cm | — |
| Common carpCyprinus carpio | 3 | 2023 | 6 | Median: 47.5 cm6 fish measuredLargest measured common carp: 59.8 cm | — |
| RuddScardinius erythrophthalmus | 3 | 2023 | 4 | Median: 15.7 cm4 fish measuredLargest measured rudd: 17.6 cm | — |
| 3-spined sticklebackGasterosteus aculeatus | 2 | 2011 | 16 | Median: 4 cm16 fish measuredLargest measured 3-spined stickleback: 5.7 cm | — |
| TenchTinca tinca | 2 | 2009 | 3 | Median: 37.5 cm3 fish measuredLargest measured tench: 42.6 cm | Recorded weight: 2 lb 7.4 oz (1.12 kg)1 fish weighed |
| DaceLeuciscus leuciscus | 2 | 2011 | 22 | Median: 21 cm22 fish measuredLargest measured dace: 23.7 cm | — |
| Stone loachBarbatula barbatula | 2 | 2017 | 2 | Median: 8.5 cm2 fish measuredLargest measured stone loach: 13 cm | — |
| BarbelBarbus barbus | 1 | 2023 | 3 | Median: 62.8 cm3 fish measuredLargest measured barbel: 63.7 cm | — |
| BleakAlburnus alburnus | 1 | 2023 | 10 | Median: 4 cm10 fish measuredLargest measured bleak: 4.5 cm | — |
| MinnowPhoxinus phoxinus | 1 | 2011 | — | — | — |
| Silver breamAbramis bjoerkna | 1 | 2023 | 64 | Median: 8.9 cm64 fish measuredLargest measured silver bream: 22 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 Len. 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 →