Ruffe · Gymnocephalus cernuus

Ruffe in the Castle Dyke

Largest measured ruffe: 15.6 cm

The largest ruffe measured in Environment Agency surveys of the Castle Dyke was 15.6 cm, recorded at Upstream Anton Gowt Lock on 8 November 1990.

Across 165 measured ruffe, the median measured length was 8.2 cm.

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

See ruffe records across England →

Most recent observation28 June 2016Gipsey Bridge · 2 fish

Largest measured ruffe: 15.6 cm
Median length: 8.2 cm
Fish measured: 165
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
15.6 cm	8 Nov 1990	Upstream Anton Gowt Lock	58267
14.1 cm	8 Nov 1990	Upstream Anton Gowt Lock	58267
14 cm	8 Nov 1990	Upstream Anton Gowt Lock	58267
13.2 cm	8 Nov 1990	Upstream Anton Gowt Lock	58267
12.7 cm	8 Nov 1990	Upstream Anton Gowt Lock	58267
12.7 cm	8 Nov 1990	Upstream Anton Gowt Lock	58267
12.2 cm	8 Nov 1990	Upstream Anton Gowt Lock	58267
12 cm	8 Nov 1990	Upstream Anton Gowt Lock	58267
11.2 cm	4 Jul 2001	Gipsey Bridge	59059
11 cm	8 Nov 1990	Upstream Anton Gowt Lock	58267

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
Gipsey Bridge	25 Oct 1990	28 Jun 2016	5
Upstream Anton Gowt Lock	8 Nov 1990	10 Aug 2011	4

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

1990–2016

Survey records by year

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

290

091

092

293

094

095

296

097

098

099

000

101

002

003

004

005

006

007

008

009

010

111

012

013

014

015

116

Fish measured by surveyors

Measured length distribution

See how the 165 measured fish were spread across different length ranges.

Smallest: 5 cm
Lower quarter: 7.5 cm
Median: 8.2 cm
Upper quarter: 9 cm
Largest: 15.6 cm

0–99 mm

147

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Castle Dyke

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

Perch Pike Roach Common bream Tench Silver bream

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 →