RiverFish

Perch · Perca fluviatilis

Perch in the River Thame

Largest measured perch: 40.6 cm

The largest perch measured in Environment Agency surveys of the River Thame was 40.6 cm, recorded at Dorchester Road Bridge on 8 September 2005.

Across 882 measured perch, the median measured length was 14.9 cm.

Surveyors recorded one individual weight: 2 lb 8 oz (1.13 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 Thame.

See perch records across England →

Most recent observation18 September 2025D/s Bear Brook · 6 fish
Largest measured perch
40.6 cm
Median length
14.9 cm
Fish measured
882
Survey locations
20

Individual EA measurements

Largest measured perch

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

LengthSurvey dateSurvey locationSurvey ID
40.6 cm8 Sept 2005Dorchester Road Bridge86032
40.3 cm5 Sept 2006Nether Winchendon - Lower Riffle101180
38.7 cm23 Sept 2008Ickford Bridge114966
38.5 cm5 Sept 2006Nether Winchendon - Lower Riffle101180
37.9 cm25 Aug 2009Shabbington (West Arm)119925
37.6 cm28 Sept 2010Chiselhampton124897
37 cm13 Sept 2006Old Crendon Road Bridge102386
36.9 cm13 Sept 2007Nether Winchendon - Lower Riffle107568
36.9 cm30 Sept 2005Cuddesdon86608
36.9 cm23 Sept 2004Shabbington (West Arm)82519

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 surveyedFirst recordedLast recordedVisits finding perch
D/s Bear Brook8 Sept 200418 Sept 20254
Dorchester Road Bridge14 Oct 200317 Sept 202512
Chiselhampton18 Sept 200317 Sept 202512
Cuddesdon19 Sept 200316 Sept 20259
Old Crendon Road Bridge4 Sept 20039 Sept 202512
Upstream of Notley Abbey5 Sept 200616 Sept 20225
Ickford Bridge3 Sept 200313 Sept 202212
Downstream Eythrope16 Aug 201613 Sept 20223
Waterstock Mill20 Sept 200428 Aug 201910
Shabbington (West Arm)20 Aug 200221 Aug 201912
Nether Winchendon - Lower Riffle9 Sept 200318 Aug 20178
Eythrope_Historic Channel Site Three14 Jul 200829 Jul 20133
Eythrope_Riffles Site Two16 Jul 20089 Jul 20102
Eythrope_ByPass Channel Site Two15 Jul 20088 Jul 20102
Eythrope9 Sept 20038 Sept 20095
Eythrope_Riffles Site Three17 Jul 200817 Jul 20081
Eythrope_Riffles Site One16 Jul 200816 Jul 20081
Eythrope_ByPass Channel Site One15 Jul 200815 Jul 20081
Eythrope_Historic Channel Site One14 Jul 200814 Jul 20081
Nether Winchendon - Original Enhancement5 Aug 200210 Sept 20032

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

2002–2025

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 882 measured fish were spread across different length ranges.

Smallest
4.6 cm
Lower quarter
10.9 cm
Median
14.9 cm
Upper quarter
20.4 cm
Largest
40.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

One individual weight was recorded for this fish and river. This is a subset of the measured fish and may not represent the whole population.

Recorded weight
2 lb 8 oz (1.13 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 Thame

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

Chub Roach Gudgeon Dace Pike Bleak

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 →