Gudgeon · Gobio gobio

Gudgeon in the By Brook main river

Largest measured gudgeon: 17.2 cm

The largest gudgeon measured in Environment Agency surveys of the By Brook main river was 17.2 cm, recorded at D/s Bathford Paper mill on 12 September 2013.

Across 44 measured gudgeon, the median measured length was 14.1 cm.

Surveyors recorded weights for 27 gudgeon. The median was 1.4 oz (0.041 kg) and the largest recorded weight was 2 oz (0.056 kg).

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

See gudgeon records across England →

Most recent observation12 September 2013D/s Bathford Paper mill · 17 fish

Largest measured gudgeon: 17.2 cm
Median length: 14.1 cm
Fish measured: 44
Survey locations: 3

Individual EA measurements

Largest measured gudgeon

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
17.2 cm	12 Sept 2013	D/s Bathford Paper mill	138671
16.7 cm	12 Sept 2013	D/s Bathford Paper mill	138671
16.3 cm	7 May 1999	Middlehill	23183
15.8 cm	7 May 1999	Middlehill	23183
15.5 cm	7 May 1999	Middlehill	23183
15.2 cm	7 May 1999	Middlehill	23183
15 cm	12 Sept 2013	D/s Bathford Paper mill	138671
15 cm	7 May 1999	Middlehill	23183
15 cm	7 May 1999	Middlehill	23183
15 cm	7 May 1999	Middlehill	23183

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 surveyed	First recorded	Last recorded	Visits finding gudgeon
D/s Bathford Paper mill	12 Sept 2013	12 Sept 2013	1
Drewett's Mill	13 May 1999	13 May 1999	1
Middlehill	7 May 1999	7 May 1999	1

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

1999–2013

Survey records by year

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

299

000

001

002

003

004

005

006

007

008

009

010

011

012

113

Fish measured by surveyors

Measured length distribution

See how the 44 measured fish were spread across different length ranges.

Smallest: 4.5 cm
Lower quarter: 12.4 cm
Median: 14.1 cm
Upper quarter: 14.9 cm
Largest: 17.2 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 27 gudgeon. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.6 oz (0.016 kg)
Lower quarter: 1.1 oz (0.0315 kg)
Median: 1.4 oz (0.041 kg)
Upper quarter: 1.6 oz (0.045 kg)
Heaviest: 2 oz (0.056 kg)

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

More fish in this river

Explore the By Brook main river

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

Brown / sea trout Bullhead 3-spined stickleback Minnow Stone loach 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 →