River Alt
12 fish species have been recorded at 15 locations along the River Alt.
- Fish species
- 12
- Places surveyed
- 15
- Survey visits
- 22
- Records span
- 1996–2026
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 |
|---|---|---|---|---|---|
| 3-spined sticklebackGasterosteus aculeatus | 12 | 2026 | — | — | — |
| GudgeonGobio gobio | 6 | 2026 | 211 | Median: 11.1 cm150 fish measuredLargest measured gudgeon: 14.5 cm | — |
| FlounderPlatichthys flesus | 6 | 2026 | 22 | Median: 10 cm15 fish measuredLargest measured flounder: 20.1 cm | — |
| ChubLeuciscus cephalus | 5 | 2026 | 57 | Median: 25.9 cm57 fish measuredLargest measured chub: 36 cm | — |
| European eelAnguilla anguilla | 4 | 2026 | 35 | Median: 29 cm35 fish measuredLargest measured european eel: 51 cm | — |
| RoachRutilus rutilus | 4 | 2015 | 75 | Median: 10 cm75 fish measuredLargest measured roach: 23.5 cm | — |
| PikeEsox lucius | 3 | 2005 | 6 | Median: 48 cm6 fish measuredLargest measured pike: 56 cm | — |
| Stone loachBarbatula barbatula | 2 | 2026 | — | — | — |
| PerchPerca fluviatilis | 2 | 2026 | 5 | Median: 14.2 cm5 fish measuredLargest measured perch: 25.9 cm | — |
| Brown / sea troutSalmo trutta | 1 | 2005 | 3 | Median: 29 cm3 fish measuredLargest measured brown / sea trout: 34.6 cm | — |
| Common carpCyprinus carpio | 1 | 2005 | 1 | Recorded length: 27.5 cm1 fish measured | — |
| DaceLeuciscus leuciscus | 1 | 2005 | 1 | Recorded length: 24 cm1 fish measured | — |
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 Alt. 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 →