RiverFish

Gudgeon · Gobio gobio

Gudgeon in the River Monkey island

Largest measured gudgeon: 13.9 cm

The largest gudgeon measured in Environment Agency surveys of the River Monkey island was 13.9 cm, recorded at Monkey Island Upstream Fry on 18 August 2015.

Across 1,025 measured gudgeon, the median measured length was 5.2 cm.

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

See gudgeon records across England →

Most recent observation4 September 2025Monkey Island Upstream Fry · 11 fish
Largest measured gudgeon
13.9 cm
Median length
5.2 cm
Fish measured
1,025
Survey locations
2

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
13.9 cm18 Aug 2015Monkey Island Upstream Fry146040
13.2 cm18 Aug 2015Monkey Island Upstream Fry146040
13 cm29 Aug 2013Monkey Island Downstream Fry138583
13 cm24 Aug 2011Monkey Island Upstream Fry130078
12.8 cm18 Aug 2015Monkey Island Upstream Fry146040
12.8 cm18 Aug 2015Monkey Island Upstream Fry146040
12.8 cm18 Aug 2015Monkey Island Upstream Fry146040
12.8 cm29 Aug 2013Monkey Island Upstream Fry138582
12.7 cm18 Aug 2015Monkey Island Upstream Fry146040
12.6 cm18 Aug 2015Monkey Island Upstream Fry146040

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
Monkey Island Upstream Fry21 Aug 20034 Sept 202514
Monkey Island Downstream Fry21 Aug 200318 Aug 201510

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

2003–2025

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 1,025 measured fish were spread across different length ranges.

Smallest
2.1 cm
Lower quarter
4.3 cm
Median
5.2 cm
Upper quarter
6.8 cm
Largest
13.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Monkey island

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

Perch Chub Roach Dace Minnow Bleak

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 →