RiverFish

Chub · Leuciscus cephalus

Chub in the River Thame

Largest measured chub: 55 cm

The largest chub measured in Environment Agency surveys of the River Thame was 55 cm, recorded at Ickford Bridge on 11 September 2025.

Across 3,394 measured chub, the median measured length was 18.2 cm.

Surveyors recorded one individual weight: 5 lb 8 oz (2.49 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 chub records across England →

Most recent observation18 September 2025D/s Bear Brook · 5 fish
Largest measured chub
55 cm
Median length
18.2 cm
Fish measured
3,394
Survey locations
22

Individual EA measurements

Largest measured chub

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

LengthSurvey dateSurvey locationSurvey ID
55 cm11 Sept 2025Ickford Bridge178507
54.6 cm18 Sept 2025D/s Bear Brook178724
52.9 cm11 Sept 2025Ickford Bridge178507
52.8 cm6 Sept 2005Ickford Bridge86006
52.4 cm20 Sept 2004Ickford Bridge82520
52 cm28 Sept 2010Chiselhampton124897
52 cm16 Jul 2008Eythrope_Riffles Site Two112010
51.9 cm30 Aug 2016Ickford Bridge149143
51.8 cm8 Jul 2010Eythrope_Historic Channel Site Three122706
51.6 cm8 Jul 2010Eythrope_Historic Channel Site Three122706

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

Explore the river

Where chub were found

Each point marks a survey location with at least one chub 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 chub
D/s Bear Brook11 Sept 200318 Sept 20254
Dorchester Road Bridge14 Oct 200317 Sept 202512
Chiselhampton18 Sept 200317 Sept 202512
Waterstock Mill20 Sept 200416 Sept 202511
Cuddesdon19 Sept 200316 Sept 202512
Ickford Bridge3 Sept 200311 Sept 202513
Old Crendon Road Bridge4 Sept 20039 Sept 202512
Nether Winchendon - Lower Riffle5 Aug 200228 Aug 202512
Upstream of Notley Abbey20 Aug 200216 Sept 202213
Downstream Eythrope16 Aug 201613 Sept 20223
Shabbington (West Arm)20 Aug 200221 Aug 201912
Kingsey Cuttle Brook9 Aug 20169 Aug 20161
Eythrope_Historic Channel Site Three14 Jul 20084 Aug 20144
Eythrope_ByPass Channel Site Two15 Jul 20084 Aug 20144
Eythrope_ByPass Channel Site One15 Jul 200829 Jul 20132
Eythrope_Riffles Site Two16 Jul 20089 Jul 20102
Eythrope9 Sept 20038 Sept 20095
Eythrope_Riffles Site Three17 Jul 200817 Jul 20081
Eythrope_Riffles Site One16 Jul 200816 Jul 20081
Eythrope_Historic Channel Site Two14 Jul 200814 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 chub that year.

Fish measured by surveyors

Measured length distribution

See how the 3,394 measured fish were spread across different length ranges.

Smallest
2.5 cm
Lower quarter
10.9 cm
Median
18.3 cm
Upper quarter
38.2 cm
Largest
55 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
5 lb 8 oz (2.49 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.

Roach Gudgeon Dace Perch 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 →