RiverFish

Minnow · Phoxinus phoxinus

Minnow in the River Colne

Largest measured minnow: 10.5 cm

The largest minnow measured in Environment Agency surveys of the River Colne was 10.5 cm, recorded at Uxbridge on 28 July 2004.

Across 256 measured minnow, the median measured length was 5.5 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 Colne.

See minnow records across England →

Most recent observation21 July 2026Uxbridge
Largest measured minnow
10.5 cm
Median length
5.5 cm
Fish measured
256
Survey locations
16

Individual EA measurements

Largest measured minnow

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

LengthSurvey dateSurvey locationSurvey ID
10.5 cm28 Jul 2004Uxbridge80753
8.8 cm27 Jul 2005Stanwell Moor85240
8.2 cm28 Jul 2004Uxbridge80753
7.8 cm9 Aug 2005Springwell Lane86949
7.5 cm3 Jul 2004Springwell Lane81495
7.2 cm9 Aug 2005Springwell Lane86949
7.2 cm3 Jul 2004Springwell Lane81495
7.1 cm28 Jul 2004Uxbridge80753
7.1 cm8 Jul 2003Drop Lane76368
7 cm9 Aug 2005Springwell Lane86949

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

Explore the river

Where minnow were found

Each point marks a survey location with at least one minnow 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 minnow
Uxbridge20 Aug 200221 Jul 202616
Watford M1 link road10 Jul 200316 Jul 202617
Springwell Lane11 Feb 198615 Jun 202619
Stanwell Moor27 Jul 200528 May 202612
Wall Hall11 Jul 200314 May 202620
Colney Heath16 Apr 202616 Apr 20261
Drop Lane8 Jul 200323 May 20238
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
Denham1 Dec 200416 Jul 20154
u/s West Drayton Mill24 Sept 201330 Sept 20142
Longbridge Way, Uxbridge29 May 201229 May 20121
Merchant Taylor27 Jun 200727 Jun 20071

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 minnow that year.

Fish measured by surveyors

Measured length distribution

See how the 256 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
5 cm
Median
5.5 cm
Upper quarter
6.1 cm
Largest
10.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Colne

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

Chub Perch Roach Pike Dace Gudgeon

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 →