RiverFish

Ruffe · Gymnocephalus cernuus

Ruffe in the River Ember FAS

Largest measured ruffe: 12 cm

The largest ruffe measured in Environment Agency surveys of the River Ember FAS was 12 cm, recorded at Downstream Esher STW on 15 July 1986.

Across 67 measured ruffe, the median measured length was 8.5 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 Ember FAS.

See ruffe records across England →

Most recent observation24 July 2025Below Island Barn Weir · 3 fish
Largest measured ruffe
12 cm
Median length
8.5 cm
Fish measured
67
Survey locations
3

Individual EA measurements

Largest measured ruffe

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

LengthSurvey dateSurvey locationSurvey ID
12 cm15 Jul 1986Downstream Esher STW103272
12 cm15 Jul 1986Downstream Esher STW103272
11.9 cm19 Oct 2010Below Island Barn Weir124895
11.3 cm5 Oct 2005Below Island Barn Weir87045
11 cm14 May 1993Downstream Esher STW103170
10.8 cm15 Jul 1986Downstream Esher STW103272
10.7 cm14 May 1993Downstream Esher STW103170
10.5 cm5 Oct 2005Below Island Barn Weir87045
10.5 cm15 Jul 1986Downstream Esher STW103272
10 cm5 Oct 2005Below Island Barn Weir87045

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 surveyedFirst recordedLast recordedVisits finding ruffe
Below Island Barn Weir9 Oct 200224 Jul 20255
Downstream Esher STW15 Jul 198614 May 19933
Upstream Esher STW22 May 199022 May 19901

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

1986–2025

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 67 measured fish were spread across different length ranges.

Smallest
3.4 cm
Lower quarter
7.1 cm
Median
8.5 cm
Upper quarter
9.5 cm
Largest
12 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ember FAS

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

European eel Roach Perch Pike Dace Bleak

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 →