Bullhead · Cottus gobio

Bullhead in the Copyhold Stream

Largest measured bullhead: 10.2 cm

The largest bullhead measured in Environment Agency surveys of the Copyhold Stream was 10.2 cm, recorded at Bridge Farm sq on 8 July 2002.

Across 52 measured bullhead, the median measured length was 6.2 cm.

Surveyors recorded weights for 33 bullhead. The median was 0.1 oz (0.004 kg) and the largest recorded weight was 0.5 oz (0.015 kg).

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

See bullhead records across England →

Most recent observation20 August 2025Bridge Farm Q · 5 fish

Largest measured bullhead: 10.2 cm
Median length: 6.2 cm
Fish measured: 52
Survey locations: 3

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
10.2 cm	8 Jul 2002	Bridge Farm sq	61360
9.9 cm	8 Jul 2002	Bridge Farm sq	61360
9.7 cm	8 Jul 2002	Bridge Farm sq	61360
9.7 cm	8 Jul 2002	Bridge Farm sq	61360
9.6 cm	8 Jul 2002	Bridge Farm sq	61360
9.5 cm	8 Jul 2002	Bridge Farm sq	61360
9 cm	8 Jul 2002	Bridge Farm sq	61360
8.9 cm	8 Jul 2002	Bridge Farm sq	61360
8.9 cm	8 Jul 2002	Bridge Farm sq	61360
8.9 cm	8 Jul 2002	Bridge Farm sq	61360

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
Copyhold Farm	20 Aug 2025	20 Aug 2025	1
Bridge Farm Q	20 Aug 2025	20 Aug 2025	1
Bridge Farm sq	8 Jul 2002	8 Jul 2002	1

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 bullhead that year.

102

003

004

005

006

007

008

009

010

011

012

013

014

015

016

017

018

019

020

021

022

023

024

225

Fish measured by surveyors

Measured length distribution

See how the 52 measured fish were spread across different length ranges.

Smallest: 2.5 cm
Lower quarter: 3.7 cm
Median: 6.3 cm
Upper quarter: 8.4 cm
Largest: 10.2 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 33 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 oz (0.001 kg)
Median: 0.1 oz (0.004 kg)
Upper quarter: 0.4 oz (0.01 kg)
Heaviest: 0.5 oz (0.015 kg)

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

More fish in this river

Explore the Copyhold Stream

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

European eel Brown / sea trout

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 →