Bourn/Black Brook
15 fish species have been recorded at 7 locations along the Bourn/Black Brook.
- Fish species
- 15
- Places surveyed
- 7
- Survey visits
- 32
- Records span
- 1991–2026
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 |
|---|---|---|---|---|---|
| RoachRutilus rutilus | 7 | 2025 | 845 | Median: 12.5 cm834 fish measuredLargest measured roach: 31 cm | — |
| DaceLeuciscus leuciscus | 7 | 2019 | 784 | Median: 17.1 cm601 fish measuredLargest measured dace: 28 cm | — |
| Brown / sea troutSalmo trutta | 6 | 2025 | 191 | Median: 28.4 cm191 fish measuredLargest measured brown / sea trout: 56 cm | — |
| BullheadCottus gobio | 6 | 2026 | 70 | Median: 2.7 cm20 fish measuredLargest measured bullhead: 6.5 cm | — |
| Stone loachBarbatula barbatula | 6 | 2026 | 30 | Median: 9.8 cm10 fish measuredLargest measured stone loach: 13.1 cm | — |
| 3-spined sticklebackGasterosteus aculeatus | 6 | 2026 | 36 | Median: 1.7 cm16 fish measuredLargest measured 3-spined stickleback: 2.4 cm | — |
| ChubLeuciscus cephalus | 6 | 2015 | 234 | Median: 19.6 cm195 fish measuredLargest measured chub: 41.6 cm | — |
| GudgeonGobio gobio | 5 | 2015 | 332 | Median: 11.1 cm270 fish measuredLargest measured gudgeon: 16.2 cm | — |
| PerchPerca fluviatilis | 5 | 2015 | 48 | Median: 19.3 cm45 fish measuredLargest measured perch: 25.8 cm | — |
| MinnowPhoxinus phoxinus | 3 | 2015 | 67 | Median: 4.4 cm17 fish measuredLargest measured minnow: 7.2 cm | — |
| PikeEsox lucius | 2 | 1996 | 5 | Median: 62.6 cm5 fish measuredLargest measured pike: 67.5 cm | — |
| 10-spined sticklebackPungitius pungitius | 1 | 2013 | — | — | — |
| Common carpCyprinus carpio | 1 | 2003 | 1 | Recorded length: 35.9 cm1 fish measured | — |
| Spined loachCobitis taenia | 1 | 2015 | 7 | Median: 7.7 cm2 fish measuredLargest measured spined loach: 9.2 cm | — |
| TenchTinca tinca | 1 | 1999 | 1 | Recorded length: 10.5 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 Bourn/Black Brook. 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 →