RiverFish

Ruffe · Gymnocephalus cernuus

Ruffe in the River Blackwater

Largest measured ruffe: 16.2 cm

The largest ruffe measured in Environment Agency surveys of the River Blackwater was 16.2 cm, recorded at Saint Marys Road on 24 May 1993.

Across 172 measured ruffe, the median measured length was 11.5 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 Blackwater.

See ruffe records across England →

Most recent observation13 October 2011Saint Marys Road · 1 fish
Largest measured ruffe
16.2 cm
Median length
11.5 cm
Fish measured
172
Survey locations
10

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
16.2 cm24 May 1993Saint Marys Road14125
16 cm20 Sept 1999Saint Marys Road14191
16 cm24 May 1993Saint Marys Road14125
15.9 cm24 Apr 1990Ashmans Farm14091
15.6 cm13 Aug 1984Stock Hall14026
15.2 cm24 May 1993Saint Marys Road14125
15.2 cm24 Apr 1987Saint Marys Road14061
15.1 cm27 Apr 1987Blue Mills14055
15.1 cm23 Apr 1987Downstream Braxted Hall14056
15 cm18 Sept 2008Saint Marys Road115026

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
Saint Marys Road27 Jul 198413 Oct 20119
Blue Mills27 Apr 198711 Oct 201113
Greys Mill15 Apr 19873 Oct 20053
Stock Hall13 Aug 198410 Oct 20025
Ashmans Farm3 Aug 19843 Oct 20024
Langford14 Aug 198423 Sept 19965
Upstream Braxted Hall8 Aug 198410 Sept 19964
Braxted FGS6 Aug 198428 May 19933
Smallands Hall2 May 19902 May 19901
Downstream Braxted Hall7 Aug 198430 Apr 19903

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

1984–2011

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 172 measured fish were spread across different length ranges.

Smallest
7.5 cm
Lower quarter
10.5 cm
Median
11.5 cm
Upper quarter
13.3 cm
Largest
16.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Blackwater

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

Roach Chub Gudgeon European eel Perch Dace

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 →