RiverFish

Gudgeon · Gobio gobio

Gudgeon in the Grand Union Canal

Largest measured gudgeon: 13.8 cm

The largest gudgeon measured in Environment Agency surveys of the Grand Union Canal was 13.8 cm, recorded at Kensal Road on 25 March 1988.

Across 142 measured gudgeon, the median measured length was 8.2 cm.

Surveyors recorded weights for 73 gudgeon. The median was 0.2 oz (0.005 kg) and the largest recorded weight was 3.5 oz (0.1 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 gudgeon records across England →

Most recent observation16 September 2013Springwell Backwater · 4 fish
Largest measured gudgeon
13.8 cm
Median length
8.2 cm
Fish measured
142
Survey locations
11

Individual EA measurements

Largest measured gudgeon

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
13.8 cm25 Mar 1988Kensal Road116192
12.5 cm31 Mar 1987Berkhamsted116251
12 cm25 Mar 1988Kensal Road116192
11.6 cm9 Mar 1988Cassiobury Park u/s Lock116407
11.5 cm25 Mar 1988Kensal Road116192
11.3 cm3 Jun 1987Bankside116196
11 cm25 Mar 1988Kensal Road116192
11 cm3 Mar 1988Winkwell Lane, Bourne End116491
11 cm31 Mar 1987Berkhamsted116251
11 cm31 Mar 1987Berkhamsted116251

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

Explore the river

Where gudgeon were found

Each point marks a survey location with at least one gudgeon 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 gudgeon
Springwell Backwater16 Sept 201316 Sept 20131
u/s Widewater Lock4 Jun 20134 Jun 20131
Slough Arm at Iver North STW26 Apr 198826 Apr 19881
Hunton Bridge21 Apr 198821 Apr 19881
Hanwell29 Mar 198829 Mar 19881
Kensal Road25 Mar 198825 Mar 19881
Cassiobury Park u/s Lock9 Mar 19889 Mar 19881
Winkwell Lane, Bourne End3 Mar 19883 Mar 19881
Horsendon Lane5 Jun 19875 Jun 19871
Bankside3 Jun 19873 Jun 19871
Berkhamsted31 Mar 198731 Mar 19871

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

1987–2013

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 142 measured fish were spread across different length ranges.

Smallest
2.3 cm
Lower quarter
6 cm
Median
8.2 cm
Upper quarter
9.4 cm
Largest
13.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 73 gudgeon. This is a subset of the measured fish and may not represent the whole population.

Lightest
0 oz (0.001 kg)
Lower quarter
0.1 oz (0.002 kg)
Median
0.2 oz (0.005 kg)
Upper quarter
0.4 oz (0.01 kg)
Heaviest
3.5 oz (0.1 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 European eel Tench

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 →