Bullhead · Cottus gobio

Bullhead in the Monksilver Stream

Largest measured bullhead: 10 cm

The largest bullhead measured in Environment Agency surveys of the Monksilver Stream was 10 cm, recorded at Orchard Wyndham on 5 October 1994.

Across 276 measured bullhead, the median measured length was 5.6 cm.

Surveyors recorded weights for 76 bullhead. The median was 0.1 oz (0.003 kg) and the largest recorded weight was 0.5 oz (0.014 kg).

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

See bullhead records across England →

Most recent observation18 September 2019D/s Yarde · 219 fish

Largest measured bullhead: 10 cm
Median length: 5.6 cm
Fish measured: 276
Survey locations: 6

Individual EA measurements

Largest measured bullhead

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
10 cm	5 Oct 1994	Orchard Wyndham	79719
9.5 cm	25 Oct 1994	Downstream Catwell House	79720
9.3 cm	24 Apr 2013	D/s Yarde	135896
9 cm	18 Sept 2019	D/s Yarde	155397
8.7 cm	25 Oct 1994	Downstream Catwell House	79720
8.5 cm	5 Oct 1994	Orchard Wyndham	79719
8.4 cm	5 Oct 1994	Orchard Wyndham	79719
8.2 cm	18 Sept 2019	D/s Yarde	155397
8.1 cm	25 Oct 1994	Downstream Catwell House	79720
8 cm	24 Apr 2013	D/s Yarde	135896

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

Explore the river

Where bullhead were found

Each point marks a survey location with at least one bullhead 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 bullhead
D/s Yarde	24 Apr 2013	18 Sept 2019	2
Pond Wood	11 Oct 1994	18 Jun 1999	2
Downstream of Williton	15 Jun 1999	15 Jun 1999	1
Housepiece Copse	4 Oct 1994	11 Jun 1999	2
Orchard Wyndham	5 Oct 1994	8 Jun 1999	2
Downstream Catwell House	25 Oct 1994	25 Oct 1994	1

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

1994–2019

Survey records by year

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

494

095

096

097

098

499

000

001

002

003

004

005

006

007

008

009

010

011

012

113

014

015

016

017

018

119

Fish measured by surveyors

Measured length distribution

See how the 276 measured fish were spread across different length ranges.

Smallest: 2.5 cm
Lower quarter: 4.4 cm
Median: 5.6 cm
Upper quarter: 6.5 cm
Largest: 10 cm

0–99 mm

275

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 76 bullhead. 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: 0.1 oz (0.003 kg)
Upper quarter: 0.2 oz (0.005 kg)
Heaviest: 0.5 oz (0.014 kg)

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

More fish in this river

Explore the Monksilver Stream

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

Brown / sea trout European eel Rainbow trout Stone loach

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 →