River Middle Ouse
24 fish species have been recorded at 42 locations along the River Middle Ouse.
- Fish species
- 24
- Places surveyed
- 42
- Survey visits
- 1,257
- Records span
- 1989–2025
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 |
|---|---|---|---|---|---|
| PerchPerca fluviatilis | 41 | 2025 | 12,973 | Median: 8.3 cm9,070 fish measuredLargest measured perch: 38.3 cm | — |
| RoachRutilus rutilus | 41 | 2025 | 92,257 | Median: 9.3 cm56,119 fish measuredLargest measured roach: 28.8 cm | — |
| PikeEsox lucius | 41 | 2025 | 1,158 | Median: 27.8 cm1,062 fish measuredLargest measured pike: 84.3 cm | — |
| BleakAlburnus alburnus | 40 | 2025 | 8,977 | Median: 10.3 cm5,353 fish measuredLargest measured bleak: 14.8 cm | Recorded weight: 0.1 oz (0.003 kg)1 fish weighed |
| GudgeonGobio gobio | 39 | 2025 | 8,343 | Median: 9.8 cm6,615 fish measuredLargest measured gudgeon: 14.8 cm | — |
| Common breamAbramis brama | 38 | 2025 | 4,636 | Median: 11.3 cm3,268 fish measuredLargest measured common bream: 56.3 cm | — |
| DaceLeuciscus leuciscus | 37 | 2025 | 4,707 | Median: 10.4 cm3,369 fish measuredLargest measured dace: 30.8 cm | — |
| RuffeGymnocephalus cernuus | 37 | 2019 | 3,667 | Median: 8.8 cm3,419 fish measuredLargest measured ruffe: 15.3 cm | — |
| ChubLeuciscus cephalus | 33 | 2018 | 729 | Median: 10.3 cm440 fish measuredLargest measured chub: 37.3 cm | — |
| Silver breamAbramis bjoerkna | 33 | 2016 | 1,653 | Median: 7.8 cm1,026 fish measuredLargest measured silver bream: 29.8 cm | — |
| TenchTinca tinca | 30 | 2019 | 141 | Median: 35.8 cm95 fish measuredLargest measured tench: 48.8 cm | — |
| European eelAnguilla anguilla | 28 | 2024 | 639,211 | Median: 11.4 cm4,924 fish measuredLargest measured european eel: 80 cm | Median: 3.9 oz (0.11 kg)34 fish weighedLargest measured: 1 lb 11.9 oz (0.79 kg) |
| RuddScardinius erythrophthalmus | 25 | 2019 | 429 | Median: 10.8 cm162 fish measuredLargest measured rudd: 25.3 cm | — |
| ZanderSander lucioperca | 16 | 2013 | 71 | Median: 15.3 cm65 fish measuredLargest measured zander: 66.3 cm | — |
| BullheadCottus gobio | 12 | 2025 | 27 | Median: 6.3 cm13 fish measuredLargest measured bullhead: 8.3 cm | — |
| Common carpCyprinus carpio | 7 | 2015 | 10 | Median: 54.8 cm10 fish measuredLargest measured common carp: 61.8 cm | — |
| FlounderPlatichthys flesus | 6 | 2007 | 73 | Median: 5.3 cm72 fish measuredLargest measured flounder: 31.3 cm | — |
| Spined loachCobitis taenia | 6 | 2025 | 24 | Median: 6.4 cm16 fish measuredLargest measured spined loach: 8 cm | — |
| Stone loachBarbatula barbatula | 6 | 2015 | 14 | Median: 6.8 cm3 fish measuredLargest measured stone loach: 8 cm | — |
| BitterlingRhodeus sericeus | 5 | 2019 | 129 | Median: 6.5 cm126 fish measuredLargest measured bitterling: 9.9 cm | — |
| 3-spined sticklebackGasterosteus aculeatus | 4 | 2015 | 6 | Median: 3.9 cm4 fish measuredLargest measured 3-spined stickleback: 4.8 cm | — |
| 10-spined sticklebackPungitius pungitius | 1 | 2009 | 1 | — | — |
| Brook lampreyLampetra planeri | 1 | 2016 | 1 | Recorded length: 10.4 cm1 fish measured | — |
| Crucian carpCarassius carassius | 1 | 1999 | 1 | Recorded length: 10.8 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 Middle 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 →