River Onny
12 fish species have been recorded at 23 locations along the River Onny.
- Fish species
- 12
- Places surveyed
- 23
- Survey visits
- 78
- Records span
- 1991–2025
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 |
|---|---|---|---|---|---|
| BullheadCottus gobio | 21 | 2025 | 654 | Median: 6.3 cm99 fish measuredLargest measured bullhead: 9.5 cm | — |
| Stone loachBarbatula barbatula | 20 | 2025 | 520 | Median: 7 cm90 fish measuredLargest measured stone loach: 11.1 cm | — |
| MinnowPhoxinus phoxinus | 19 | 2025 | 523 | Median: 4.4 cm73 fish measuredLargest measured minnow: 8.4 cm | — |
| Brown / sea troutSalmo trutta | 16 | 2025 | 2,545 | Median: 14 cm2,029 fish measuredLargest measured brown / sea trout: 39.7 cm | — |
| Atlantic salmonSalmo salar | 14 | 2025 | 2,525 | Median: 7.8 cm2,077 fish measuredLargest measured atlantic salmon: 20.9 cm | — |
| European eelAnguilla anguilla | 6 | 2025 | 128 | Median: 38 cm119 fish measuredLargest measured european eel: 64 cm | — |
| GraylingThymallus thymallus | 5 | 2025 | 291 | Median: 10.4 cm288 fish measuredLargest measured grayling: 33.4 cm | — |
| ChubLeuciscus cephalus | 4 | 2025 | 81 | Median: 24.1 cm47 fish measuredLargest measured chub: 41.1 cm | — |
| GudgeonGobio gobio | 4 | 2025 | 44 | Median: 10.5 cm43 fish measuredLargest measured gudgeon: 13.7 cm | — |
| 3-spined sticklebackGasterosteus aculeatus | 3 | 2024 | 3 | Recorded length: 4 cm1 fish measuredView 3-spined stickleback measurement → | — |
| Brook lampreyLampetra planeri | 2 | 2024 | — | — | — |
| TenchTinca tinca | 1 | 2016 | 1 | Recorded length: 11.1 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 Onny. 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 →