RiverFish

Bullhead · Cottus gobio

Bullhead in the River Onny

Largest measured bullhead: 9.5 cm

The largest bullhead measured in Environment Agency surveys of the River Onny was 9.5 cm, recorded at Cwnd House on 4 June 2014.

Across 99 measured bullhead, the median measured length was 6.3 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 Onny.

See bullhead records across England →

Most recent observation10 September 2025Craven Arms (DS Halford Weir)
Largest measured bullhead
9.5 cm
Median length
6.3 cm
Fish measured
99
Survey locations
21

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
9.5 cm4 Jun 2014Cwnd House140972
9.1 cm10 Jun 2013Park Farm136315
8.4 cm18 Jun 2014Park Farm141479
8.1 cm10 Jun 2013Park Farm136315
8 cm18 Jun 2014Park Farm141479
8 cm10 Jun 2014Linley141462
8 cm10 Jun 2013Park Farm136315
7.9 cm10 Jun 2013Park Farm136315
7.8 cm10 Jun 2014Linley141462
7.8 cm10 Jun 2013Park Farm136315

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
Craven Arms (DS Halford Weir)4 Aug 202110 Sept 20255
Bromfield8 May 200329 Aug 20256
Park Farm8 May 200328 Aug 202514
Upstream Plowden Mill11 Aug 202120 Aug 20255
Horderley30 Jun 199320 Aug 20257
Appletree30 Jul 202530 Jul 20251
Cwnd House18 May 199328 Aug 20245
Wooton Farm - Riffle28 Sept 202328 Sept 20231
Bromfield - Riffle28 Sept 202328 Sept 20231
Upstream Plowden Mill - Riffle27 Sept 202327 Sept 20231
Park Farm - Riffle27 Sept 202327 Sept 20231
Myndmill Bridge - Riffle27 Sept 202327 Sept 20231
Horderley - Riffle27 Sept 202327 Sept 20231
Craven Arms (ds Halford Weir) - Riffle27 Sept 202327 Sept 20231
Plowden Upstream Weir26 Sept 202210 Aug 20232
Whitcot Farm19 May 199310 Aug 20213
Linley18 May 199310 Aug 20213
Bow House19 May 19934 Aug 20214
Plowden - Red carded19 May 199319 May 19931
Nind18 May 199318 May 19931
Gatton18 May 199318 May 19931

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

1993–2025

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 99 measured fish were spread across different length ranges.

Smallest
1.5 cm
Lower quarter
5.5 cm
Median
6.3 cm
Upper quarter
7.1 cm
Largest
9.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Onny

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

Stone loach Minnow Brown / sea trout Atlantic salmon European eel Grayling

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 →