Gudgeon · Gobio gobio

Gudgeon in the Main River Biss

Largest measured gudgeon: 15.9 cm

The largest gudgeon measured in Environment Agency surveys of the Main River Biss was 15.9 cm, recorded at Ashton Hill Farm on 31 July 1997.

Across 23 measured gudgeon, the median measured length was 12.3 cm.

Surveyors recorded weights for 23 gudgeon. The median was 1.4 oz (0.04 kg) and the largest recorded weight was 8.6 oz (0.245 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 Biss.

See gudgeon records across England →

Most recent observation11 July 2005u/s Blackball Hatch (Te) · 4 fish

Largest measured gudgeon: 15.9 cm
Median length: 12.3 cm
Fish measured: 23
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
15.9 cm	31 Jul 1997	Ashton Hill Farm	77048
15.4 cm	31 Jul 1997	Ashton Hill Farm	77048
15.2 cm	31 Jul 1997	Ashton Hill Farm	77048
14.9 cm	31 Jul 1997	Ashton Hill Farm	77048
14.5 cm	11 Jul 2005	u/s Blackball Hatch (Te)	85029
14 cm	31 Jul 1997	Ashton Hill Farm	77048
13.5 cm	11 Jul 2005	u/s Blackball Hatch (Te)	85029
13.4 cm	14 Jul 2004	u/s Blackball Hatch (Te)	80754
13.1 cm	14 Jul 2004	u/s Blackball Hatch (Te)	80754
13 cm	14 Jul 2004	u/s Blackball Hatch (Te)	80754

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
u/s Blackball Hatch (Te)	14 Jul 2004	11 Jul 2005	2
Ladydown Mill	11 Sept 1997	11 Sept 1997	1
Ashton Hill Farm	31 Jul 1997	31 Jul 1997	1

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

1997–2005

Survey records by year

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

297

098

099

000

001

002

003

104

105

Fish measured by surveyors

Measured length distribution

See how the 23 measured fish were spread across different length ranges.

Smallest: 6.6 cm
Lower quarter: 11.5 cm
Median: 12.3 cm
Upper quarter: 13.8 cm
Largest: 15.9 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 23 gudgeon. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.1 oz (0.003 kg)
Lower quarter: 0.8 oz (0.0235 kg)
Median: 1.4 oz (0.04 kg)
Upper quarter: 2.8 oz (0.08 kg)
Heaviest: 8.6 oz (0.245 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 Biss

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

Bullhead Brown / sea trout Minnow Chub Dace 3-spined stickleback

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 →