River Great Ouse
16 fish species have been recorded at 7 locations along the River Great Ouse.
- Fish species
- 16
- Places surveyed
- 7
- Survey visits
- 98
- Records span
- 2008–2026
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 |
|---|---|---|---|---|---|
| PerchPerca fluviatilis | 7 | 2026 | 64 | Median: 8.2 cm14 fish measuredLargest measured perch: 17.8 cm | — |
| European eelAnguilla anguilla | 6 | 2026 | 189 | Median: 36.9 cm189 fish measuredLargest measured european eel: 76 cm | Median: 3.2 oz (0.09 kg)189 fish weighedLargest measured: 2 lb 12.4 oz (1.26 kg) |
| RoachRutilus rutilus | 6 | 2026 | 78 | Median: 7.3 cm14 fish measuredLargest measured roach: 20 cm | — |
| RuffeGymnocephalus cernuus | 5 | 2026 | 7 | Median: 8.7 cm4 fish measuredLargest measured ruffe: 10.3 cm | — |
| PikeEsox lucius | 2 | 2012 | 11 | Recorded length: 43.6 cm1 fish measuredView pike measurement → | — |
| GudgeonGobio gobio | 2 | 2026 | 15 | Median: 10.7 cm12 fish measuredLargest measured gudgeon: 12.1 cm | — |
| Common breamAbramis brama | 2 | 2010 | 5 | — | — |
| Spined loachCobitis taenia | 2 | 2008 | 5 | — | — |
| BleakAlburnus alburnus | 1 | 2026 | 6 | Median: 4.5 cm6 fish measuredLargest measured bleak: 10.3 cm | — |
| River lampreyLampetra fluviatilis | 1 | 2009 | 2 | Median: 34.3 cm2 fish measuredLargest measured river lamprey: 34.5 cm | Median: 2.7 oz (0.0775 kg)2 fish weighedLargest measured: 3 oz (0.085 kg) |
| BullheadCottus gobio | 1 | 2025 | 1 | Recorded length: 5.9 cm1 fish measured | — |
| FlounderPlatichthys flesus | 1 | 2008 | 1 | — | — |
| RuddScardinius erythrophthalmus | 1 | 2025 | 3 | Median: 8.3 cm3 fish measuredLargest measured rudd: 8.4 cm | — |
| Silver breamAbramis bjoerkna | 1 | 2008 | 1 | — | — |
| Stone loachBarbatula barbatula | 1 | 2025 | 2 | Median: 7.1 cm2 fish measuredLargest measured stone loach: 7.2 cm | — |
| TenchTinca tinca | 1 | 2008 | 1 | — | — |
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 Great Ouse. 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 →