River Allen
16 fish species have been recorded at 18 locations along the River Allen.
- Fish species
- 16
- Places surveyed
- 18
- Survey visits
- 60
- Records span
- 2001–2025
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 | 18 | 2025 | 3,556 | Median: 15 cm3,556 fish measuredLargest measured brown / sea trout: 49.2 cm | — |
| MinnowPhoxinus phoxinus | 18 | 2025 | 422 | — | — |
| BullheadCottus gobio | 17 | 2025 | 617 | — | — |
| Stone loachBarbatula barbatula | 16 | 2025 | 20 | — | — |
| European eelAnguilla anguilla | 12 | 2025 | 260 | Median: 34 cm251 fish measuredLargest measured european eel: 73.4 cm | — |
| Atlantic salmonSalmo salar | 12 | 2025 | 733 | Median: 8.4 cm733 fish measuredLargest measured atlantic salmon: 20.5 cm | — |
| GraylingThymallus thymallus | 6 | 2025 | 523 | Median: 20.3 cm517 fish measuredLargest measured grayling: 45.8 cm | — |
| DaceLeuciscus leuciscus | 6 | 2023 | 92 | Median: 21 cm92 fish measuredLargest measured dace: 27.5 cm | — |
| PikeEsox lucius | 5 | 2025 | 70 | Median: 35.6 cm70 fish measuredLargest measured pike: 75.8 cm | — |
| Brook lampreyLampetra planeri | 5 | 2024 | — | — | — |
| 3-spined sticklebackGasterosteus aculeatus | 3 | 2023 | — | — | — |
| GudgeonGobio gobio | 3 | 2023 | 114 | Median: 9.9 cm114 fish measuredLargest measured gudgeon: 15.5 cm | — |
| ChubLeuciscus cephalus | 3 | 2012 | 8 | Median: 45.1 cm8 fish measuredLargest measured chub: 54.1 cm | — |
| PerchPerca fluviatilis | 1 | 2010 | 5 | Median: 22.7 cm5 fish measuredLargest measured perch: 26.6 cm | — |
| River lampreyLampetra fluviatilis | 1 | 2017 | — | — | — |
| RoachRutilus rutilus | 1 | 2001 | 7 | Median: 18.8 cm7 fish measuredLargest measured roach: 22.5 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 Allen. 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 →