Ruffe · Gymnocephalus cernuus

Ruffe in the River Derwent (Yorkshire)

Largest measured ruffe: 14.6 cm

The largest ruffe measured in Environment Agency surveys of the River Derwent (Yorkshire) was 14.6 cm, recorded at Kirkham Abbey DERCORS7 on 15 September 2009.

Across 115 measured ruffe, the median measured length was 8.4 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 (Yorkshire).

See ruffe records across England →

Most recent observation30 July 2024Sutton Upon Derwent DERCORS18 · 1 fish

Largest measured ruffe: 14.6 cm
Median length: 8.4 cm
Fish measured: 115
Survey locations: 11

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
14.6 cm	15 Sept 2009	Kirkham Abbey DERCORS7	119827
14.2 cm	14 Sept 2004	Kirkham Abbey DERCORS7	84312
14.1 cm	16 Sept 2004	Sutton Upon Derwent DERCORS18	84316
13.6 cm	1 Sept 2003	Howsham DERCORS8	78340
13.6 cm	5 Sept 2001	Malton DERCORS5	24105
13.1 cm	19 Sept 2006	Malton DERCORS5	107937
12.8 cm	9 Aug 2010	Malton DERCORS5	124885
12.6 cm	24 Apr 1995	Low Hutton DERCORS6	110593
12.5 cm	9 Aug 2010	Malton DERCORS5	124885
12.5 cm	26 Sept 1997	Sutton Upon Derwent DERCORS18	109884

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
Sutton Upon Derwent DERCORS18	26 Sept 1997	30 Jul 2024	5
Stamford Bridge DERCORS10	19 Sept 1997	16 Jul 2018	13
Bubwith - Fry Survey	29 Sept 1998	20 Aug 2012	2
Kirkham Abbey DERCORS7	7 Sept 2001	10 Aug 2010	7
Yedingham DERCORS4	2 Sept 2002	9 Aug 2010	2
Malton DERCORS5	5 Sept 2001	9 Aug 2010	5
Howsham DERCORS8	12 Sept 2001	1 Sept 2003	3
Low Hutton DERCORS6	24 Apr 1995	29 Aug 2003	2
Breighton DERCORS20	16 Sept 2002	16 Sept 2002	1
Yedingham - Fry Survey	20 Sept 1989	20 Sept 1989	1
Yedingham Fish Haven - Fry Survey	18 Sept 1989	18 Sept 1989	1

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

1989–2024

Survey records by year

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

289

090

091

092

093

094

195

096

297

198

099

100

401

502

603

304

205

306

107

008

209

510

011

212

013

014

015

016

017

118

019

020

021

022

023

124

Fish measured by surveyors

Measured length distribution

See how the 115 measured fish were spread across different length ranges.

Smallest: 2 cm
Lower quarter: 4.3 cm
Median: 8.4 cm
Upper quarter: 10.2 cm
Largest: 14.6 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent (Yorkshire)

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

Minnow Bullhead Stone loach Dace European eel 3-spined stickleback

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 →