River Aln
11 fish species have been recorded at 39 locations along the River Aln.
- Fish species
- 11
- Places surveyed
- 39
- Survey visits
- 253
- Records span
- 1993–2026
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 |
|---|---|---|---|---|---|
| Brown / sea troutSalmo trutta | 39 | 2026 | 16,424 | Median: 6.8 cm9,364 fish measuredLargest measured brown / sea trout: 50 cm | — |
| European eelAnguilla anguilla | 34 | 2026 | 577 | Median: 26 cm576 fish measuredLargest measured european eel: 59 cm | — |
| Stone loachBarbatula barbatula | 30 | 2026 | 3,584 | Median: 8.5 cm25 fish measuredLargest measured stone loach: 12 cm | — |
| Atlantic salmonSalmo salar | 30 | 2026 | 3,170 | Median: 6.9 cm2,390 fish measuredLargest measured atlantic salmon: 16.8 cm | — |
| MinnowPhoxinus phoxinus | 30 | 2026 | 2,750 | Median: 6 cm9 fish measuredLargest measured minnow: 8.9 cm | — |
| 3-spined sticklebackGasterosteus aculeatus | 26 | 2026 | 385 | Median: 4.3 cm2 fish measuredLargest measured 3-spined stickleback: 5.6 cm | — |
| River lampreyLampetra fluviatilis | 21 | 2013 | 378 | Median: 12 cm350 fish measuredLargest measured river lamprey: 21 cm | — |
| Brook lampreyLampetra planeri | 13 | 2005 | — | — | — |
| BullheadCottus gobio | 1 | 2012 | 55 | — | — |
| DabLimanda limanda | 1 | 2001 | — | — | — |
| FlounderPlatichthys flesus | 1 | 1993 | — | — | — |
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 Aln. 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 →