RiverFish

Roach · Rutilus rutilus

Roach in the River Penton Hook - Chertsey

Largest measured roach: 27.6 cm

The largest roach measured in Environment Agency surveys of the River Penton Hook - Chertsey was 27.6 cm, recorded at Penton Hook to Chertsey (Laleham Main) on 17 September 2002.

Across 3,195 measured roach, the median measured length was 11.5 cm.

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

See roach records across England →

Most recent observation30 July 2025Penton Hook to Chertsey (Laleham Main) · 77 fish
Largest measured roach
27.6 cm
Median length
11.5 cm
Fish measured
3,195
Survey locations
4

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
27.6 cm17 Sept 2002Penton Hook to Chertsey (Laleham Main)72121
26.8 cm30 Jul 2025Penton Hook to Chertsey (Laleham Main)178543
26.8 cm8 Sept 2005Penton Hook Loop Upstream of Laleham Intake86915
26.4 cm30 Jul 2025Penton Hook to Chertsey (Laleham Main)178543
25.9 cm10 Sept 2007Penton Hook Loop Upstream of Laleham Intake106747
25.9 cm8 Sept 2005Penton Hook Loop Upstream of Laleham Intake86915
24.8 cm12 Sept 2006Penton Hook to Chertsey (Laleham Main)101393
24.4 cm30 Jul 2025Penton Hook to Chertsey (Laleham Main)178543
24.3 cm30 Jul 2025Penton Hook to Chertsey (Laleham Main)178543
23.5 cm30 Jul 2025Penton Hook to Chertsey (Laleham Main)178543

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
Penton Hook, Weir Stream and Pool1 Sept 199530 Jul 202523
Penton Hook to Chertsey (Laleham Main)1 Sept 199530 Jul 202524
Penton Hook Bypass Channel6 Aug 20086 Aug 20081
Penton Hook Loop Upstream of Laleham Intake8 Sept 200510 Sept 20073

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

1995–2025

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 3,195 measured fish were spread across different length ranges.

Smallest
1 cm
Lower quarter
9.1 cm
Median
11.5 cm
Upper quarter
13.9 cm
Largest
27.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Penton Hook - Chertsey

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

Chub European eel Gudgeon Bleak Dace Pike

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 →