RiverFish

Gudgeon · Gobio gobio

Gudgeon in the Main river sites

Largest measured gudgeon: 15 cm

The largest gudgeon measured in Environment Agency surveys of the Main river sites was 15 cm, recorded at S4 St Mary's Marnhull on 24 July 2002.

Across 832 measured gudgeon, the median measured length was 10.8 cm.

Surveyors recorded weights for 8 gudgeon. The median was 0.7 oz (0.0185 kg) and the largest recorded weight was 1.2 oz (0.035 kg).

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

See gudgeon records across England →

Most recent observation18 September 2025Canford School (top site S2S) · 1 fish
Largest measured gudgeon
15 cm
Median length
10.8 cm
Fish measured
832
Survey locations
36

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
15 cm24 Jul 2002S4 St Mary's Marnhull73181
14.6 cm12 Jun 2007S2 Upstream Eccliffe105618
14.6 cm17 Jul 2002S1 Gillingham73173
14.4 cm4 Jun 2009S3R Corfe Mullen to Cowgrove117536
14.4 cm13 Sept 2007Kinson107907
14.3 cm16 Sept 2025Sturminster Marshall Island180276
14.3 cm19 Sept 2024Muscliffe- Kingfisher Barn Visitor Centre168996
14.3 cm21 May 2019S1 Gillingham154495
14.1 cm19 Sept 2024Muscliffe- Kingfisher Barn Visitor Centre168996
14.1 cm19 Sept 2024Kinson168994

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
Throop d/s Glens Weir17 Sept 201918 Sept 20254
Muscliffe- Kingfisher Barn Visitor Centre17 Sept 201918 Sept 20256
Longham Bridge12 Sept 200718 Sept 20253
Kinson11 Oct 200518 Sept 20259
Canford School (top site S2S)11 Sept 200318 Sept 20253
Sturminster Marshall Island16 Sept 202516 Sept 20251
Court Farm25 Sept 200516 Sept 20253
Durweston Downstream of footbridge20 Sept 202218 Sept 20243
d/s Blandford Weir12 Sept 200718 Sept 20232
Upstream Haywards Bridge16 Sept 201918 Sept 20234
Cowgrove Weir17 Sept 200318 Sept 20237
S1 Gillingham17 Jul 20028 Jun 20238
Blandford - Stour Meadow13 Jun 201827 Jul 20223
S2 Upstream Eccliffe8 Aug 20026 Jun 20198
S5 Strangeways5 Aug 200223 May 201912
S3R Corfe Mullen to Cowgrove22 Jun 200427 Jun 20185
S2R Stourpaine to Bryanston13 Jul 200431 May 20184
Canford Mill Stream31 May 201230 May 20182
S1R Fiddleford to Child Okeford20 Jul 200417 May 201810
S6 Child okeford8 Jun 201131 May 20174
S7 Durweston8 Jun 20112 Jun 20152
S4R Dudsbury to Merritown17 Jun 200416 May 20135
Muscliffe13 Oct 200510 Sept 20123
Kinson Manor Farm (Dudsbury)10 Sept 201210 Sept 20121
The Ship Inn2 Jun 200524 Aug 20103
Blandford channel9 Aug 20109 Aug 20101
Throop d/s gauging Weir11 Sept 200911 Sept 20091
S4 St Mary's Marnhull24 Jul 200211 Jun 20095
Throop21 Oct 200313 Sept 20072
S3 Riversdale Farm2 Jun 20057 Jun 20062
Golf Course13 Oct 200513 Oct 20051
U/s Whitemill Bridge26 Sept 200526 Sept 20051
Stourpaine26 Sept 200526 Sept 20051
Keyneston Mill26 Sept 200526 Sept 20051
Hanford9 Jun 20059 Jun 20051
Crawford Bridge17 Sept 200317 Sept 20031

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

2002–2025

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 832 measured fish were spread across different length ranges.

Smallest
4.8 cm
Lower quarter
9.4 cm
Median
10.8 cm
Upper quarter
11.6 cm
Largest
15 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 8 gudgeon. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.3 oz (0.009 kg)
Lower quarter
0.5 oz (0.015 kg)
Median
0.7 oz (0.0185 kg)
Upper quarter
0.8 oz (0.0228 kg)
Heaviest
1.2 oz (0.035 kg)

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

More fish in this river

Explore the Main river sites

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

Minnow Bullhead European eel Dace Stone loach Chub

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 →