Relief Channel
28 fish species have been recorded at 19 locations along the Relief Channel.
Records updated10 August 2026Most recent survey: 2023
- Fish species
- 28
- Places surveyed
- 19
- Survey visits
- 99
- Records span
- 1988–2023
Local EA evidence
Where fish were recorded
19 of 19 places shown
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 | 19 | 2023 | 13,567 | Median: 8 cm6,470 fish measuredLargest measured perch: 34.8 cm | — |
| RoachRutilus rutilus | 19 | 2023 | 96,109 | Median: 6.3 cm38,410 fish measuredLargest measured roach: 33.8 cm | — |
| RuffeGymnocephalus cernuus | 16 | 2017 | 1,341 | Median: 6.3 cm1,168 fish measuredLargest measured ruffe: 14.8 cm | — |
| ZanderSander lucioperca | 16 | 2023 | 4,193 | Median: 12.3 cm3,959 fish measuredLargest measured zander: 87.8 cm | — |
| PikeEsox lucius | 16 | 2023 | 142 | Median: 32.3 cm121 fish measuredLargest measured pike: 78.8 cm | — |
| European eelAnguilla anguilla | 15 | 2017 | 382 | Median: 42 cm161 fish measuredLargest measured european eel: 74 cm | Median: 5.3 oz (0.15 kg)157 fish weighedLargest measured: 1 lb 15.7 oz (0.9 kg) |
| TenchTinca tinca | 15 | 2017 | 118 | Median: 9 cm96 fish measuredLargest measured tench: 52.8 cm | — |
| Common breamAbramis brama | 13 | 2023 | 3,742 | Median: 6.8 cm2,826 fish measuredLargest measured common bream: 60.1 cm | — |
| Silver breamAbramis bjoerkna | 12 | 2005 | 1,408 | Median: 10.3 cm989 fish measuredLargest measured silver bream: 31.8 cm | — |
| FlounderPlatichthys flesus | 12 | 2005 | 221 | Median: 9.3 cm221 fish measuredLargest measured flounder: 36.8 cm | — |
| SmeltOsmerus eperlanus | 12 | 1993 | 808 | Median: 10.8 cm808 fish measuredLargest measured smelt: 16.3 cm | — |
| RuddScardinius erythrophthalmus | 11 | 2023 | 61 | Median: 8.3 cm45 fish measuredLargest measured rudd: 29.8 cm | — |
| DaceLeuciscus leuciscus | 10 | 2014 | 142 | Median: 14.3 cm142 fish measuredLargest measured dace: 19.8 cm | — |
| BleakAlburnus alburnus | 10 | 2005 | 778 | Median: 10.8 cm778 fish measuredLargest measured bleak: 13.3 cm | — |
| BullheadCottus gobio | 8 | 2017 | 45 | Median: 5.4 cm34 fish measuredLargest measured bullhead: 9.2 cm | Recorded weight: 2.8 oz (0.079 kg)1 fish weighed |
| GudgeonGobio gobio | 8 | 2017 | 27 | Median: 9.5 cm23 fish measuredLargest measured gudgeon: 11.3 cm | — |
| 3-spined sticklebackGasterosteus aculeatus | 6 | 2014 | 123 | Median: 4.3 cm22 fish measuredLargest measured 3-spined stickleback: 5.4 cm | — |
| Spined loachCobitis taenia | 5 | 2017 | 14 | Median: 5.3 cm10 fish measuredLargest measured spined loach: 9 cm | — |
| Brown / sea troutSalmo trutta | 5 | 2014 | 6 | Median: 54.8 cm3 fish measuredLargest measured brown / sea trout: 68.2 cm | — |
| 10-spined sticklebackPungitius pungitius | 3 | 2014 | 7 | Median: 3.8 cm7 fish measuredLargest measured 10-spined stickleback: 4.4 cm | — |
| BitterlingRhodeus sericeus | 3 | 2023 | 25 | Median: 6.3 cm25 fish measuredLargest measured bitterling: 8.7 cm | — |
| SpratSprattus sprattus | 3 | 2005 | 13 | Median: 9.5 cm2 fish measuredLargest measured sprat: 9.5 cm | — |
| Brook lampreyLampetra planeri | 2 | 2014 | 2 | Median: 14.2 cm2 fish measuredLargest measured brook lamprey: 14.2 cm | Median: 0.6 oz (0.0175 kg)2 fish weighedLargest measured: 0.7 oz (0.02 kg) |
| Common carpCyprinus carpio | 2 | 2005 | 2 | Recorded length: 6.5 cm1 fish measured | — |
| Common gobyPomatoschistus microps | 2 | 2005 | 3 | Median: 4 cm3 fish measuredLargest measured common goby: 6 cm | — |
| Sand gobyPomatoschistus minutus | 1 | 2011 | 1 | Recorded length: 2.8 cm1 fish measured | Recorded weight: 0.1 oz (0.002 kg)1 fish weighed |
| Stone loachBarbatula barbatula | 1 | 2011 | 2 | Median: 7.6 cm2 fish measuredLargest measured stone loach: 8.8 cm | — |
| Straight-nosed pipefishNerophis ophidion | 1 | 2005 | 1 | Recorded length: 9.5 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 Relief Channel. 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 →