River Ash (Thames)
15 fish species have been recorded at 7 locations along the River Ash (Thames).
- Fish species
- 15
- Places surveyed
- 7
- Survey visits
- 13
- Records span
- 2005–2023
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 | 7 | 2023 | 270 | Median: 42 cm270 fish measuredLargest measured european eel: 75.2 cm | — |
| ChubLeuciscus cephalus | 3 | 2023 | 185 | Median: 26.5 cm185 fish measuredLargest measured chub: 51 cm | — |
| DaceLeuciscus leuciscus | 3 | 2023 | 138 | Median: 12.6 cm138 fish measuredLargest measured dace: 21.5 cm | — |
| GudgeonGobio gobio | 3 | 2023 | 88 | Median: 8 cm88 fish measuredLargest measured gudgeon: 15 cm | — |
| RoachRutilus rutilus | 3 | 2023 | 509 | Median: 11.5 cm509 fish measuredLargest measured roach: 29 cm | — |
| PerchPerca fluviatilis | 3 | 2023 | 84 | Median: 12.5 cm84 fish measuredLargest measured perch: 23.9 cm | — |
| PikeEsox lucius | 3 | 2023 | 21 | Median: 28.4 cm21 fish measuredLargest measured pike: 65.7 cm | — |
| Common breamAbramis brama | 3 | 2017 | 6 | Median: 45 cm6 fish measuredLargest measured common bream: 48.1 cm | — |
| BullheadCottus gobio | 2 | 2023 | 6 | Median: 5.3 cm6 fish measuredLargest measured bullhead: 6.7 cm | — |
| BleakAlburnus alburnus | 2 | 2023 | 12 | Median: 12.3 cm12 fish measuredLargest measured bleak: 15 cm | — |
| MinnowPhoxinus phoxinus | 2 | 2023 | — | — | — |
| Brown / sea troutSalmo trutta | 1 | 2023 | 3 | Median: 52 cm3 fish measuredLargest measured brown / sea trout: 59 cm | — |
| BarbelBarbus barbus | 1 | 2005 | 1 | Recorded length: 9 cm1 fish measured | — |
| Silver breamAbramis bjoerkna | 1 | 2017 | 1 | Recorded length: 15.4 cm1 fish measured | — |
| Stone loachBarbatula barbatula | 1 | 2010 | — | — | — |
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 Ash (Thames). 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 →