RiverFish

Bullhead · Cottus gobio

Bullhead in the River Main Ottery

Largest measured bullhead: 9.8 cm

The largest bullhead measured in Environment Agency surveys of the River Main Ottery was 9.8 cm, recorded at Downstream Trengune Br on 30 June 2023.

Across 2,574 measured bullhead, the median measured length was 4.6 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 Main Ottery.

See bullhead records across England →

Most recent observation8 July 2026Penrose · 108 fish
Largest measured bullhead
9.8 cm
Median length
4.6 cm
Fish measured
2,574
Survey locations
16

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
9.8 cm30 Jun 2023Downstream Trengune Br162749
9.1 cm20 Aug 2013Hellescott138052
8.9 cm4 Jul 2013Downstream Trengune Br136999
8.7 cm7 Jul 2015Downstream Trengune Br145370
8.6 cm30 Jun 2011Penheale126745
8.5 cm11 Aug 2023Upstream Hellescott164029
8.5 cm16 Jun 2021High Wires160695
8.4 cm20 Aug 2013Yeolm Bridge138043
8.3 cm24 May 2022Otterham Mill160985
8.3 cm9 Jul 2019Downstream Trengune Br155470

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
Penrose31 Jul 19848 Jul 202614
Downstream Trengune Br19 Jul 200728 Jul 202514
Yeolmbridge Green2 Oct 20232 Oct 20231
High Wires1 Aug 198416 Aug 20238
Upstream Hellescott11 Aug 202311 Aug 20231
Otterham Mill26 Jul 198424 May 20229
Yeolm Bridge30 Jul 198413 Oct 20219
Hellescott3 Aug 198420 Jul 20217
Downstream Yeolm Bridge10 Sept 201510 Sept 20151
Penheale31 Jul 198430 Jun 201113
Trengune2 Aug 198417 Jul 20068
Werrington Park30 Jul 19841 Jul 20033
Canworthy Water2 Aug 198417 Sept 20014
Braywood Farm1 Aug 198430 Aug 19963
Trevillian7 Jul 199324 Jul 19962
u/s Trengune Bridge11 Aug 199311 Aug 19931

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

1984–2026

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 2,574 measured fish were spread across different length ranges.

Smallest
1.7 cm
Lower quarter
3.2 cm
Median
4.6 cm
Upper quarter
5.8 cm
Largest
9.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Ottery

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

Atlantic salmon Brown / sea trout Stone loach Minnow European eel Brook lamprey

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 →