RiverFish

Ruffe · Gymnocephalus cernuus

Ruffe in the River Ouse/Ure eel surveys

Largest measured ruffe: 12.5 cm

The largest ruffe measured in Environment Agency surveys of the River Ouse/Ure eel surveys was 12.5 cm, recorded at Upstream Linton Lock Fyke Nets on 16 June 2014.

Across 221 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 Ouse/Ure eel surveys.

See ruffe records across England →

Most recent observation2 June 2026Overton Ings Fyke nets · 7 fish
Largest measured ruffe
12.5 cm
Median length
8.5 cm
Fish measured
221
Survey locations
2

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
12.5 cm16 Jun 2014Upstream Linton Lock Fyke Nets141736
11.4 cm15 Jun 2022Overton Ings Fyke nets161184
11.4 cm9 Jun 2016Overton Ings Fyke nets148192
11.2 cm9 Jun 2016Overton Ings Fyke nets148192
11.1 cm3 Jun 2024Upstream Linton Lock Fyke Nets165112
11.1 cm13 Jun 2018Upstream Linton Lock Fyke Nets152638
11.1 cm16 Jun 2014Upstream Linton Lock Fyke Nets141736
11 cm3 Jun 2024Upstream Linton Lock Fyke Nets165112
10.9 cm3 Jun 2024Upstream Linton Lock Fyke Nets165112
10.5 cm14 Jun 2022Upstream Linton Lock Fyke Nets161186

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
Overton Ings Fyke nets17 Jun 20142 Jun 20266
Upstream Linton Lock Fyke Nets16 Jun 20141 Jun 20266

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

2014–2026

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 221 measured fish were spread across different length ranges.

Smallest
3.2 cm
Lower quarter
6.6 cm
Median
8.5 cm
Upper quarter
9.4 cm
Largest
12.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ouse/Ure eel surveys

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

European eel 3-spined stickleback Bullhead Stone loach Roach 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 →