Ruffe · Gymnocephalus cernuus

Ruffe in the River Thet

Largest measured ruffe: 14.8 cm

The largest ruffe measured in Environment Agency surveys of the River Thet was 14.8 cm, recorded at Kilverstone Estate on 24 November 1995.

Across 36 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 Thet.

See ruffe records across England →

Most recent observation29 November 1995Thetford · 5 fish

Largest measured ruffe: 14.8 cm
Median length: 8.8 cm
Fish measured: 36
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
14.8 cm	24 Nov 1995	Kilverstone Estate	30025
14.8 cm	15 Feb 1993	Thetford	30019
14.8 cm	15 Feb 1993	Thetford	30019
14.8 cm	15 Feb 1993	Thetford	30019
13.8 cm	15 Feb 1993	Thetford	30019
12.8 cm	15 Feb 1993	Thetford	30019
12.3 cm	15 Feb 1993	Thetford	30019
12.3 cm	15 Feb 1993	Thetford	30019
12.3 cm	15 Feb 1993	Thetford	30019
11.8 cm	29 Nov 1995	Thetford	30026

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
Thetford	15 Feb 1993	29 Nov 1995	2
Kilverstone Estate	11 Feb 1993	24 Nov 1995	2
Brettenham	12 Feb 1993	23 Nov 1995	2

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

1993–1995

Survey records by year

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

393

094

395

Fish measured by surveyors

Measured length distribution

See how the 36 measured fish were spread across different length ranges.

Smallest: 4.8 cm
Lower quarter: 6.3 cm
Median: 8.8 cm
Upper quarter: 11.9 cm
Largest: 14.8 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Thet

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

Roach Pike Gudgeon Perch Dace European eel

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 →