Ruffe · Gymnocephalus cernuus

Ruffe in the River Wallers Haven

Largest measured ruffe: 12 cm

The largest ruffe measured in Environment Agency surveys of the River Wallers Haven was 12 cm, recorded at Downstream Boreham Bridge on 24 June 2010.

Across 173 measured ruffe, the median measured length was 5.3 cm.

Surveyors recorded weights for 43 ruffe. The median was 0.3 oz (0.008 kg) and the largest recorded weight was 0.7 oz (0.019 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 Wallers Haven.

See ruffe records across England →

Most recent observation14 October 2025Horse Bridge · 1 fish

Largest measured ruffe: 12 cm
Median length: 5.3 cm
Fish measured: 173
Survey locations: 4

Individual EA measurements

Largest measured ruffe

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
12 cm	24 Jun 2010	Downstream Boreham Bridge	122999
10.7 cm	29 Aug 2003	Upstream Boreham Bridge	76999
10.3 cm	29 Aug 2003	Upstream Boreham Bridge	76999
10.3 cm	29 Aug 2003	Upstream Boreham Bridge	76999
10.2 cm	29 Aug 2003	Upstream Boreham Bridge	76999
10 cm	7 Sept 2016	Horse Bridge	149221
10 cm	24 Jun 2010	Downstream Boreham Bridge	122999
9.9 cm	29 Aug 2003	Upstream Boreham Bridge	76999
9.7 cm	29 Aug 2003	Upstream Boreham Bridge	76999
9.6 cm	7 Sept 2016	Horse Bridge	149221

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

Explore the river

Where ruffe were found

Each point marks a survey location with at least one ruffe 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 ruffe
Horse Bridge	23 Oct 2009	14 Oct 2025	4
Upstream Boreham Bridge	29 Aug 2003	9 Sept 2025	4
Middle Bridge	1 Oct 2003	5 Jul 2016	2
Downstream Boreham Bridge	24 Jun 2010	24 Jun 2010	1

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 ruffe that year.

203

104

105

006

007

008

109

110

011

012

013

014

015

216

017

018

119

020

021

022

023

024

225

Fish measured by surveyors

Measured length distribution

See how the 173 measured fish were spread across different length ranges.

Smallest: 2.7 cm
Lower quarter: 4.8 cm
Median: 5.3 cm
Upper quarter: 7.3 cm
Largest: 12 cm

0–99 mm

166

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 43 ruffe. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.002 kg)
Lower quarter: 0.1 oz (0.003 kg)
Median: 0.3 oz (0.008 kg)
Upper quarter: 0.4 oz (0.011 kg)
Heaviest: 0.7 oz (0.019 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 Wallers Haven

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

Perch European eel Roach Pike Common bream 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 →