RiverFish

Chub · Leuciscus cephalus

Chub in the River Colne

Largest measured chub: 58.1 cm

The largest chub measured in Environment Agency surveys of the River Colne was 58.1 cm, recorded at Moor roundabout 2 on 12 March 1986.

Across 3,328 measured chub, the median measured length was 17.2 cm.

Surveyors recorded weights for 239 chub. The median was 1 lb 1.5 oz (0.496 kg) and the largest recorded weight was 3 lb 9.4 oz (1.63 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 Colne.

See chub records across England →

Most recent observation21 July 2026Uxbridge · 13 fish
Largest measured chub
58.1 cm
Median length
17.2 cm
Fish measured
3,328
Survey locations
34

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
58.1 cm12 Mar 1986Moor roundabout 2116074
57.2 cm15 Jun 2026Springwell Lane181731
54 cm25 May 2023Wall Hall163586
54 cm18 Jun 2014Stanwell Moor141226
53.2 cm25 May 2023Wall Hall163586
53 cm26 May 2009Springwell Lane117316
52.7 cm30 May 2012Springwell Lane132644
52.6 cm25 May 2010Springwell Lane121710
52.6 cm26 May 2009Springwell Lane117316
52.5 cm13 Jun 2024Wall Hall166452

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
Uxbridge29 Mar 199921 Jul 202617
Watford M1 link road21 Sept 200016 Jul 202620
Springwell Lane11 Feb 198615 Jun 202625
Stanwell Moor6 Mar 198628 May 202623
Wall Hall11 Jul 200314 May 202621
Colney Heath27 Mar 201316 Apr 20262
Drop Lane13 Jul 200423 May 202311
Watford Tesco Extra26 Jul 202226 Jul 20221
Lairage Land26 Jul 202226 Jul 20221
Heathrow EP: Little Britain31 Oct 201931 Oct 20191
Heathrow EP: Poyle Channel28 Oct 201928 Oct 20191
Denham 2.019 Jul 201819 Jul 20181
The Withey Beds20 May 201515 May 20172
Merchant Taylors CPUE21 Sept 201521 Sept 20151
Merchant Taylor27 Jun 200721 Sept 20153
u/s West Drayton Mill30 Sept 201430 Sept 20141
Merchant Taylor Backwater16 Sept 201316 Sept 20131
Longbridge Way, Uxbridge29 May 201229 May 20121
Cowley, Old Mill Lane19 May 200919 May 20091
Denham1 Dec 200429 Jul 20084
Harefield Road17 Jun 198617 Jun 19861
Old Mill Lane12 Jun 198612 Jun 19861
Cricketfield Lane16 May 198616 May 19861
Stanwell Road8 May 19868 May 19861
Poyle Channel7 May 19867 May 19861
Staines Moor13 Mar 198613 Mar 19861
Moor roundabout 212 Mar 198612 Mar 19861
Moor Roundabout4 Mar 198612 Mar 19862
Packetboat Lane27 Feb 198627 Feb 19861
Uxbridge Moor26 Feb 198626 Feb 19861
Milupa Factory20 Feb 198620 Feb 19861
Denham Court19 Feb 198619 Feb 19861
Maple Cross12 Feb 198612 Feb 19861
Mill End11 Feb 198611 Feb 19861

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 chub that year.

Fish measured by surveyors

Measured length distribution

See how the 3,328 measured fish were spread across different length ranges.

Smallest
1.3 cm
Lower quarter
11.6 cm
Median
17.2 cm
Upper quarter
30.8 cm
Largest
58.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 239 chub. This is a subset of the measured fish and may not represent the whole population.

Lightest
0 oz (0.001 kg)
Lower quarter
5.1 oz (0.145 kg)
Median
1 lb 1.5 oz (0.496 kg)
Upper quarter
1 lb 9.8 oz (0.7315 kg)
Heaviest
3 lb 9.4 oz (1.63 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 Colne

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

Perch Roach Pike Dace Gudgeon Bullhead

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 →