RiverFish

Bullhead · Cottus gobio

Bullhead in the River Marlow

Largest measured bullhead: 5.7 cm

The largest bullhead measured in Environment Agency surveys of the River Marlow was 5.7 cm, recorded at Marlow Downstream Fry on 19 August 2008.

Across 65 measured bullhead, the median measured length was 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 River Marlow.

See bullhead records across England →

Most recent observation22 August 2024Marlow Downstream Fry · 2 fish
Largest measured bullhead
5.7 cm
Median length
4 cm
Fish measured
65
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.

LengthSurvey dateSurvey locationSurvey ID
5.7 cm19 Aug 2008Marlow Downstream Fry125580
5 cm22 Aug 2012Marlow Downstream Fry135306
5 cm21 Aug 2006Marlow Downstream Fry111826
5 cm21 Aug 2006Marlow Downstream Fry111826
5 cm21 Aug 2006Marlow Downstream Fry111826
5 cm21 Aug 2006Marlow Downstream Fry111826
5 cm21 Aug 2006Marlow Downstream Fry111826
5 cm21 Aug 2006Marlow Downstream Fry111826
4.9 cm21 Aug 2006Marlow Upstream Fry111827
4.9 cm21 Aug 2006Marlow Downstream Fry111826

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 surveyedFirst recordedLast recordedVisits finding bullhead
Marlow Downstream Fry21 Aug 200622 Aug 20247
Marlow Upstream Fry21 Aug 200629 Aug 20134

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

2006–2024

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 65 measured fish were spread across different length ranges.

Smallest
2.2 cm
Lower quarter
3.3 cm
Median
4 cm
Upper quarter
4.5 cm
Largest
5.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Marlow

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

Minnow Gudgeon Chub Roach Bleak Dace

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 →