Perch · Perca fluviatilis

Perch in the River Colnebrook

Largest measured perch: 31.4 cm

The largest perch measured in Environment Agency surveys of the River Colnebrook was 31.4 cm, recorded at Thorney Golf Course on 6 June 2012.

Across 463 measured perch, the median measured length was 14.6 cm.

Surveyors recorded weights for 47 perch. The median was 0.6 oz (0.017 kg) and the largest recorded weight was 7.2 oz (0.205 kg).

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

See perch records across England →

Most recent observation2 June 2026Wraysbury · 20 fish

Largest measured perch: 31.4 cm
Median length: 14.6 cm
Fish measured: 463
Survey locations: 7

Individual EA measurements

Largest measured perch

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

Length	Survey date	Survey location	Survey ID
31.4 cm	6 Jun 2012	Thorney Golf Course	132249
30 cm	21 Aug 2006	Thorney Golf Course	100777
29.4 cm	8 Jun 2010	Thorney Golf Course	121849
28.5 cm	8 Jun 2010	Thorney Golf Course	121849
28.3 cm	17 Jun 2015	Thorney Golf Course	144970
28 cm	12 Jun 2007	Thorney Golf Course	105525
27.3 cm	21 Aug 2006	Thorney Golf Course	100777
25.7 cm	21 Aug 2006	Thorney Golf Course	100777
25.6 cm	14 Jun 2011	Hythe End	126579
25 cm	18 Jun 2008	Thorney Golf Course	111358

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

Explore the river

Where perch were found

Each point marks a survey location with at least one perch 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 surveyed	First recorded	Last recorded	Visits finding perch
Wraysbury	3 Jun 2015	2 Jun 2026	9
Thorney Golf Course	13 May 1986	20 Jun 2023	15
Hythe End	20 Nov 2001	6 Jun 2014	10
Horton Upstream Site	24 Apr 2010	24 Apr 2010	1
Horton Upstream Backloop	24 Apr 2010	24 Apr 2010	1
Horton Downstream site	23 Apr 2010	23 Apr 2010	1
Iver	15 May 1986	15 May 1986	1

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

1986–2026

Survey records by year

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

286

087

088

089

090

091

092

093

094

095

096

097

098

099

000

201

202

103

104

105

106

207

208

209

510

111

212

113

114

215

116

117

218

119

020

021

022

223

124

125

126

Fish measured by surveyors

Measured length distribution

See how the 463 measured fish were spread across different length ranges.

Smallest: 5.6 cm
Lower quarter: 11.4 cm
Median: 14.6 cm
Upper quarter: 17.3 cm
Largest: 31.4 cm

0–99 mm

100–199 mm

351

200–299 mm

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 47 perch. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.2 oz (0.0045 kg)
Lower quarter: 0.3 oz (0.0093 kg)
Median: 0.6 oz (0.017 kg)
Upper quarter: 3.2 oz (0.092 kg)
Heaviest: 7.2 oz (0.205 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Colnebrook

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

European eel Roach Chub Pike Gudgeon Minnow

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 →