RiverFish

Ruffe · Gymnocephalus cernuus

Ruffe in the River Derwent

Largest measured ruffe: 15 cm

The largest ruffe measured in Environment Agency surveys of the River Derwent was 15 cm, recorded at Alvaston on 22 April 1993.

Across 7 measured ruffe, the median measured length was 10.8 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 Derwent.

See ruffe records across England →

Most recent observation10 September 2018Belper Weir Salmon Parr
Largest measured ruffe
15 cm
Median length
10.8 cm
Fish measured
7
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
15 cm22 Apr 1993Alvaston25698
11.3 cm17 Sept 2014Nooning Lane142947
10.8 cm17 Sept 2014Nooning Lane142947
10.8 cm17 Sept 2014Nooning Lane142947
10.8 cm1 Jul 2010Nooning Lane122567
10 cm25 Jul 2017Nooning Lane151011
9.5 cm1 Jul 2010Nooning Lane122567

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
Belper Weir Salmon Parr10 Sept 201810 Sept 20181
Nooning Lane1 Jul 201025 Jul 20173
Alvaston22 Apr 199322 Apr 19931

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

1993–2018

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 7 measured fish were spread across different length ranges.

Smallest
9.5 cm
Lower quarter
10.4 cm
Median
10.8 cm
Upper quarter
11.1 cm
Largest
15 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent

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

Brown / sea trout Bullhead Minnow Grayling Chub Stone loach

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 →