Dace · Leuciscus leuciscus

Dace in the River Colnebrook

Largest measured dace: 24.1 cm

The largest dace measured in Environment Agency surveys of the River Colnebrook was 24.1 cm, recorded at Hythe End on 5 August 2004.

Across 261 measured dace, the median measured length was 13.1 cm.

Surveyors recorded weights for 125 dace. The median was 0.7 oz (0.021 kg) and the largest recorded weight was 5.5 oz (0.155 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 dace records across England →

Most recent observation2 June 2026Wraysbury · 2 fish

Largest measured dace: 24.1 cm
Median length: 13.1 cm
Fish measured: 261
Survey locations: 5

Individual EA measurements

Largest measured dace

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
24.1 cm	5 Aug 2004	Hythe End	80912
24.1 cm	5 Aug 2004	Hythe End	80912
23.7 cm	13 Jul 2005	Hythe End	85049
23.4 cm	13 May 1986	Thorney Golf Course	115731
23.3 cm	4 Jul 2012	Hythe End	132439
23.1 cm	5 Aug 2004	Hythe End	80912
23 cm	13 Jul 2005	Hythe End	85049
23 cm	13 Jul 2005	Hythe End	85049
23 cm	13 Jul 2005	Hythe End	85049
22.7 cm	13 May 1986	Thorney Golf Course	115731

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

Explore the river

Where dace were found

Each point marks a survey location with at least one dace 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 dace
Wraysbury	3 Jun 2015	2 Jun 2026	7
Thorney Golf Course	13 May 1986	20 Jun 2023	4
Hythe End	20 Nov 2001	6 Jun 2014	11
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 dace that year.

286

087

088

089

090

091

092

093

094

095

096

097

098

099

000

201

202

103

104

105

006

107

108

009

210

111

112

013

114

115

116

117

018

119

020

021

022

223

124

025

126

Fish measured by surveyors

Measured length distribution

See how the 261 measured fish were spread across different length ranges.

Smallest: 4.6 cm
Lower quarter: 11.4 cm
Median: 13.1 cm
Upper quarter: 16.2 cm
Largest: 24.1 cm

0–99 mm

100–199 mm

199

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 125 dace. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.002 kg)
Lower quarter: 0.6 oz (0.016 kg)
Median: 0.7 oz (0.021 kg)
Upper quarter: 1.2 oz (0.034 kg)
Heaviest: 5.5 oz (0.155 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 Perch Roach Chub Pike 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 →