Rudd · Scardinius erythrophthalmus

Rudd in the Grand Union Canal

Largest measured rudd: 22.5 cm

The largest rudd measured in Environment Agency surveys of the Grand Union Canal was 22.5 cm, recorded at Berkhamsted on 31 March 1987.

Across 71 measured rudd, the median measured length was 13.4 cm.

Surveyors recorded weights for 66 rudd. The median was 1.5 oz (0.042 kg) and the largest recorded weight was 8.7 oz (0.247 kg).

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

See rudd records across England →

Most recent observation29 March 1988Hanwell · 8 fish

Largest measured rudd: 22.5 cm
Median length: 13.4 cm
Fish measured: 71
Survey locations: 4

Individual EA measurements

Largest measured rudd

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
22.5 cm	31 Mar 1987	Berkhamsted	116251
22.5 cm	9 Dec 1986	York Way	116132
22 cm	31 Mar 1987	Berkhamsted	116251
21 cm	31 Mar 1987	Berkhamsted	116251
20.2 cm	31 Mar 1987	Berkhamsted	116251
19.8 cm	31 Mar 1987	Berkhamsted	116251
19.6 cm	31 Mar 1987	Berkhamsted	116251
19.5 cm	31 Mar 1987	Berkhamsted	116251
19.4 cm	31 Mar 1987	Berkhamsted	116251
19 cm	31 Mar 1987	Berkhamsted	116251

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where rudd were found

Each point marks a survey location with at least one rudd 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 rudd
Hanwell	29 Mar 1988	29 Mar 1988	1
Horsendon Lane	5 Jun 1987	5 Jun 1987	1
Berkhamsted	31 Mar 1987	31 Mar 1987	1
York Way	9 Dec 1986	9 Dec 1986	1

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

1986–1988

Survey records by year

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

186

287

188

Fish measured by surveyors

Measured length distribution

See how the 71 measured fish were spread across different length ranges.

Smallest: 2.2 cm
Lower quarter: 10.4 cm
Median: 13.4 cm
Upper quarter: 16.5 cm
Largest: 22.5 cm

0–99 mm

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 66 rudd. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.2 oz (0.005 kg)
Lower quarter: 0.5 oz (0.0155 kg)
Median: 1.5 oz (0.042 kg)
Upper quarter: 3.3 oz (0.0948 kg)
Heaviest: 8.7 oz (0.247 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the Grand Union Canal

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

Perch Roach Pike Common bream Gudgeon 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 →