Dace · Leuciscus leuciscus

Dace in the Roman River (Headwaters)

Largest measured dace: 22.5 cm

The largest dace measured in Environment Agency surveys of the Roman River (Headwaters) was 22.5 cm, recorded at Colchester Zoo on 6 March 2009.

Across 155 measured dace, the median measured length was 12 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Roman River (Headwaters).

See dace records across England →

Most recent observation5 October 2025Colchester Zoo · 1 fish

Largest measured dace: 22.5 cm
Median length: 12 cm
Fish measured: 155
Survey locations: 2

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
22.5 cm	6 Mar 2009	Colchester Zoo	117105
22.3 cm	5 Feb 2015	Colchester Zoo	144595
21.5 cm	6 Mar 2009	Colchester Zoo	117105
21.2 cm	5 Feb 2015	Colchester Zoo	144595
21.1 cm	6 Mar 2009	Colchester Zoo	117105
21 cm	5 Feb 2015	Colchester Zoo	144595
20.9 cm	6 Mar 2009	Colchester Zoo	117105
20.4 cm	5 Feb 2015	Colchester Zoo	144595
20.4 cm	6 Mar 2009	Colchester Zoo	117105
20.4 cm	6 Mar 2009	Colchester Zoo	117105

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
Colchester Zoo	18 Mar 2003	5 Oct 2025	7
Swan Bridge	18 Mar 2003	5 Feb 2015	2

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

2003–2025

Survey records by year

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

203

004

005

006

007

008

109

010

011

012

013

014

215

016

117

018

019

020

021

122

023

124

125

Fish measured by surveyors

Measured length distribution

See how the 155 measured fish were spread across different length ranges.

Smallest: 7.5 cm
Lower quarter: 10.1 cm
Median: 12 cm
Upper quarter: 15.8 cm
Largest: 22.5 cm

0–99 mm

100–199 mm

108

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Roman River (Headwaters)

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

Stone loach European eel 3-spined stickleback Brown / sea trout Roach Minnow

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 →