Ruffe · Gymnocephalus cernuus

Ruffe in the Louth Canal

Largest measured ruffe: 14.5 cm

The largest ruffe measured in Environment Agency surveys of the Louth Canal was 14.5 cm, recorded at Tetney Lock on 1 June 2004.

Across 1,177 measured ruffe, the median measured length was 6 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Louth Canal.

See ruffe records across England →

Most recent observation22 June 2015Tetney Lock · 5 fish

Largest measured ruffe: 14.5 cm
Median length: 6 cm
Fish measured: 1,177
Survey locations: 4

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
14.5 cm	1 Jun 2004	Tetney Lock	80252
13.5 cm	28 Apr 2004	Firebeacon	79724
13.2 cm	12 May 2010	Firebeacon	124151
13.2 cm	1 Jun 2004	Tetney Lock	80252
13.1 cm	1 Jun 2004	Tetney Lock	80252
13 cm	1 Jun 2004	Tetney Lock	80252
12.9 cm	3 Oct 2012	Firebeacon	134356
12.8 cm	1 Jun 2004	Tetney Lock	80252
12.7 cm	1 Jun 2004	Tetney Lock	80252
12.7 cm	7 Sept 1995	Thoresby Bridge	58046

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
Tetney Lock	8 Sept 1995	22 Jun 2015	6
Thoresby Bridge	10 Sept 1992	17 Jun 2015	4
Firebeacon	6 Sept 1995	3 Oct 2012	5
Austen Fen	5 Sept 1995	5 Sept 1995	1

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

1992–2015

Survey records by year

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

192

093

094

495

096

097

098

399

000

001

002

003

204

005

006

007

008

009

210

011

212

013

014

215

Fish measured by surveyors

Measured length distribution

See how the 1,177 measured fish were spread across different length ranges.

Smallest: 3.8 cm
Lower quarter: 5.2 cm
Median: 6 cm
Upper quarter: 7 cm
Largest: 14.5 cm

0–99 mm

1083

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Louth Canal

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

Roach European eel 3-spined stickleback Gudgeon Perch Pike

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 →