Bullhead · Cottus gobio

Bullhead in the Trenmore Stream

Largest measured bullhead: 7.8 cm

The largest bullhead measured in Environment Agency surveys of the Trenmore Stream was 7.8 cm, recorded at Cork on 15 June 2017.

Across 27 measured bullhead, the median measured length was 5.4 cm.

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

See bullhead records across England →

Most recent observation15 June 2017Cork · 18 fish

Largest measured bullhead: 7.8 cm
Median length: 5.4 cm
Fish measured: 27
Survey locations: 2

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
7.8 cm	15 Jun 2017	Cork	150735
7.2 cm	15 Jun 2017	Cork	150735
6.9 cm	15 Jun 2017	Cork	150735
6.5 cm	15 Jun 2017	Cork	150735
6.5 cm	15 Jun 2017	Cork	150735
6.5 cm	7 Jun 2011	Cork	126895
6.4 cm	15 Jun 2017	Cork	150735
6.4 cm	15 Jun 2017	Cork	150735
6.3 cm	7 Jun 2011	Cork	126895
6.2 cm	7 Jun 2011	Cork	126895

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
Cork	7 Sept 1988	15 Jun 2017	6
Tremore	26 Aug 1997	26 Aug 1997	1

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

1988–2017

Survey records by year

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

188

089

090

091

092

093

094

095

096

297

098

099

100

001

002

003

004

005

106

007

008

009

010

111

012

013

014

015

016

117

Fish measured by surveyors

Measured length distribution

See how the 27 measured fish were spread across different length ranges.

Smallest: 1.9 cm
Lower quarter: 3.8 cm
Median: 5.4 cm
Upper quarter: 6.4 cm
Largest: 7.8 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Trenmore Stream

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

Brown / sea trout European eel Atlantic salmon

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 →