RiverFish

Roach · Rutilus rutilus

Roach in the Turkey Brook

Largest measured roach: 21.1 cm

The largest roach measured in Environment Agency surveys of the Turkey Brook was 21.1 cm, recorded at Forty Hall on 30 June 2026.

Across 450 measured roach, the median measured length was 10.1 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Turkey Brook.

See roach records across England →

Most recent observation30 June 2026Forty Hall · 55 fish
Largest measured roach
21.1 cm
Median length
10.1 cm
Fish measured
450
Survey locations
9

Individual EA measurements

Largest measured roach

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
21.1 cm30 Jun 2026Forty Hall182132
20 cm3 Dec 2013d/s Cuffley Brook confluence140282
19.6 cm13 Dec 2013Whitewebbs Golf Course140380
19.4 cm27 Nov 2013Rotenone neutralisation zone140279
18.9 cm5 Oct 2015d/s Cuffley Brook confluence146868
18.8 cm27 Nov 2013Rotenone neutralisation zone140279
18.7 cm13 Dec 2013Whitewebbs Golf Course140380
18.5 cm16 Apr 2014d/s Cuffley Brook confluence140666
18.4 cm3 Dec 2013d/s Cuffley Brook confluence140282
18.2 cm27 Aug 2014d/s Cuffley Brook confluence142459

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where roach were found

Each point marks a survey location with at least one roach record.

Choose a point on the map to see what was recorded there.

Map points are approximate and don’t show fishing access. Check local permissions before visiting.

Place surveyedFirst recordedLast recordedVisits finding roach
Forty Hall4 May 200630 Jun 20267
Whitewebbs Golf Course13 Dec 201321 Oct 20193
Upstream Albany Park9 Oct 20179 Oct 20171
d/s Cuffley Brook confluence3 Dec 20135 Oct 20155
Albany Park4 Dec 201329 Sept 20143
Rotenone neutralisation zone 227 Nov 201327 Nov 20131
Rotenone neutralisation zone27 Nov 201327 Nov 20131
Forty Hall TMG26 Mar 200920 Apr 20102
12th T at Golf Club16 May 200616 May 20061

Choose a point or table row to see the location. More survey visits can mean more records, but not necessarily more fish.

2006–2026

Survey records by year

Each bar shows how many survey visits recorded roach that year.

Fish measured by surveyors

Measured length distribution

See how the 450 measured fish were spread across different length ranges.

Smallest
3.3 cm
Lower quarter
8.5 cm
Median
10.1 cm
Upper quarter
12.6 cm
Largest
21.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Turkey Brook

Compare other species with enough survey and measurement data for a detailed page.

Minnow Stone loach 3-spined stickleback Bullhead Gudgeon European eel

Before you fish

Good to know

These are past survey records, so the fish present today may be different. Map points are approximate—check local access, permissions and fishing rules before visiting.

Learn how RiverFish uses the data →