Ruffe · Gymnocephalus cernuus

Ruffe in the River Idle

Largest measured ruffe: 12.9 cm

The largest ruffe measured in Environment Agency surveys of the River Idle was 12.9 cm, recorded at Bawtry on 4 May 2011.

Across 19 measured ruffe, the median measured length was 10 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 Idle.

See ruffe records across England →

Most recent observation25 April 2017Bawtry · 8 fish

Largest measured ruffe: 12.9 cm
Median length: 10 cm
Fish measured: 19
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.

Length	Survey date	Survey location	Survey ID
12.9 cm	4 May 2011	Bawtry	126161
12.5 cm	20 Sept 2005	Chain Bridge Lane	86535
12.2 cm	25 Apr 2017	Bawtry	150362
12 cm	8 May 2014	Bawtry	140757
11.6 cm	8 May 2014	Bawtry	140757
10.9 cm	8 May 2014	Bawtry	140757
10.9 cm	8 May 2014	Bawtry	140757
10.8 cm	8 May 2014	Bawtry	140757
10.6 cm	25 Apr 2017	Bawtry	150362
10 cm	18 May 2010	Bawtry	121693

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
Bawtry	18 May 2010	25 Apr 2017	4
Chain Bridge Lane	20 Sept 2005	20 Sept 2005	1

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

2005–2017

Survey records by year

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

105

006

007

008

009

110

111

012

013

114

015

016

117

Fish measured by surveyors

Measured length distribution

See how the 19 measured fish were spread across different length ranges.

Smallest: 5.8 cm
Lower quarter: 7.2 cm
Median: 10 cm
Upper quarter: 11.3 cm
Largest: 12.9 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Idle

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

European eel Roach Perch Pike Chub 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 →