Ruffe · Gymnocephalus cernuus

Ruffe in the River Duston Branch

Largest measured ruffe: 12 cm

The largest ruffe measured in Environment Agency surveys of the River Duston Branch was 12 cm, recorded at Upton Mill on 18 September 1992.

Across 28 measured ruffe, the median measured length was 8.8 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 Duston Branch.

See ruffe records across England →

Most recent observation14 October 2009Kislingbury

Largest measured ruffe: 12 cm
Median length: 8.8 cm
Fish measured: 28
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.

Length	Survey date	Survey location	Survey ID
12 cm	18 Sept 1992	Upton Mill	54120
11.5 cm	18 Sept 1992	Upton Mill	54120
10.3 cm	6 Sept 1989	Upton Mill	54110
10 cm	18 Sept 1992	Upton Mill	54120
10 cm	10 Sept 1992	Kislingbury	54119
9.8 cm	6 Sept 1989	Upton Mill	54110
9.5 cm	18 Sept 1992	Upton Mill	54120
9.5 cm	10 Sept 1992	Kislingbury	54119
9.3 cm	6 Sept 1989	Upton Mill	54110
9.3 cm	6 Sept 1989	Upton Mill	54110

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
Kislingbury	10 Sept 1992	14 Oct 2009	2
Upton Mill	6 Sept 1989	18 Sept 1992	2
Nether Heyford	16 Sept 1992	16 Sept 1992	1

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

1989–2009

Survey records by year

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

189

090

091

392

093

094

095

096

097

098

099

000

001

002

003

004

005

006

007

008

109

Fish measured by surveyors

Measured length distribution

See how the 28 measured fish were spread across different length ranges.

Smallest: 4.5 cm
Lower quarter: 8.3 cm
Median: 8.8 cm
Upper quarter: 9.5 cm
Largest: 12 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Duston Branch

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

Bullhead Brown / sea trout Pike Perch 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 →