Great Eau FMU
20 fish species have been recorded at 14 locations along the Great Eau FMU.
- Fish species
- 20
- Places surveyed
- 14
- Survey visits
- 78
- Records span
- 1986–2024
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 | 13 | 2022 | 2,280 | Median: 29 cm42 fish measuredLargest measured european eel: 45.5 cm | — |
| 3-spined sticklebackGasterosteus aculeatus | 13 | 2018 | 1,122 | Median: 5 cm679 fish measuredLargest measured 3-spined stickleback: 15 cm | — |
| Stone loachBarbatula barbatula | 11 | 2024 | 119 | Median: 7.4 cm119 fish measuredLargest measured stone loach: 13.7 cm | — |
| RoachRutilus rutilus | 10 | 2015 | 17,961 | Median: 12.1 cm11,875 fish measuredLargest measured roach: 42 cm | — |
| PikeEsox lucius | 10 | 2018 | 137 | Median: 41.2 cm137 fish measuredLargest measured pike: 86.5 cm | — |
| DaceLeuciscus leuciscus | 10 | 2014 | 1,811 | Median: 16.2 cm1,811 fish measuredLargest measured dace: 31 cm | — |
| PerchPerca fluviatilis | 10 | 2022 | 153 | Median: 14.1 cm153 fish measuredLargest measured perch: 36.8 cm | — |
| Silver breamAbramis bjoerkna | 8 | 1996 | 1,066 | Median: 11.4 cm533 fish measuredLargest measured silver bream: 30 cm | — |
| Common breamAbramis brama | 7 | 2003 | 3,345 | Median: 13.3 cm1,310 fish measuredLargest measured common bream: 53.8 cm | — |
| Brown / sea troutSalmo trutta | 5 | 2024 | 743 | Median: 18.3 cm743 fish measuredLargest measured brown / sea trout: 42.6 cm | — |
| BullheadCottus gobio | 5 | 2024 | 159 | Median: 7.4 cm159 fish measuredLargest measured bullhead: 15.2 cm | — |
| Rainbow troutOncorhynchus mykiss | 5 | 2022 | 878 | Median: 27.9 cm438 fish measuredLargest measured rainbow trout: 45.6 cm | — |
| GraylingThymallus thymallus | 5 | 2022 | 101 | Median: 23.6 cm101 fish measuredLargest measured grayling: 34.5 cm | — |
| RuddScardinius erythrophthalmus | 5 | 2003 | 11 | Median: 11.8 cm11 fish measuredLargest measured rudd: 22.8 cm | — |
| FlounderPlatichthys flesus | 4 | 2015 | 101 | Median: 8.6 cm101 fish measuredLargest measured flounder: 29.6 cm | — |
| Brook lampreyLampetra planeri | 3 | 2012 | 7 | — | — |
| TenchTinca tinca | 3 | 2009 | 8 | Median: 13.2 cm8 fish measuredLargest measured tench: 40.9 cm | — |
| River lampreyLampetra fluviatilis | 2 | 1992 | — | — | — |
| Common gobyPomatoschistus microps | 2 | 1989 | 40 | Median: 6.6 cm40 fish measuredLargest measured common goby: 7.4 cm | — |
| SpratSprattus sprattus | 1 | 1989 | 7 | Median: 5.9 cm7 fish measuredLargest measured sprat: 6.8 cm | — |
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 Great Eau FMU. 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 →