RiverFish

Ruffe · Gymnocephalus cernuus

Ruffe in the River Nidd

Largest measured ruffe: 14.7 cm

The largest ruffe measured in Environment Agency surveys of the River Nidd was 14.7 cm, recorded at Knaresborough Bypass on 3 July 2014.

Across 212 measured ruffe, the median measured length was 10.3 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 Nidd.

See ruffe records across England →

Most recent observation9 July 2025Knaresborough Bypass · 1 fish
Largest measured ruffe
14.7 cm
Median length
10.3 cm
Fish measured
212
Survey locations
8

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
14.7 cm3 Jul 2014Knaresborough Bypass141544
13.8 cm2 Aug 2012Knaresborough Bypass132789
13.7 cm10 Sept 2007Knaresborough Bypass108738
13.3 cm3 Jul 2014Knaresborough Bypass141544
13.3 cm26 Aug 2003Knaresborough Bypass78464
13.2 cm9 Aug 2005Knaresborough Bypass88056
13.2 cm9 Aug 2005Knaresborough Bypass88056
13.1 cm3 Jul 2014Knaresborough Bypass141544
13.1 cm5 Aug 2004Knaresborough Bypass82046
13 cm3 Jul 2014Knaresborough Bypass141544

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
Knaresborough Bypass26 Aug 20039 Jul 202516
Kirk Hammerton - Fry Survey20 Sept 198414 Aug 20244
Skip Bridge16 Jul 202416 Jul 20241
Cowthorpe10 Jul 201419 Jul 20182
Goldsborough22 Jul 201522 Jul 20151
Ribston Park5 Aug 20043 Jul 20148
Kirk Hammerton27 Aug 20038 Jul 20113
Nun Monkton21 Aug 200221 Aug 20021

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

1984–2025

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 212 measured fish were spread across different length ranges.

Smallest
3.4 cm
Lower quarter
8.8 cm
Median
10.4 cm
Upper quarter
11.5 cm
Largest
14.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Nidd

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

Minnow Bullhead Stone loach Grayling Brown / sea trout European eel

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 →