RiverFish

Stone loach · Barbatula barbatula

Stone loach in the River Monnow

Largest measured stone loach: 10.6 cm

The largest stone loach measured in Environment Agency surveys of the River Monnow was 10.6 cm, recorded at Clodock on 23 August 2013.

Across 14 measured stone loach, 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 Monnow.

See stone loach records across England →

Most recent observation5 August 2025Clodock
Largest measured stone loach
10.6 cm
Median length
4.6 cm
Fish measured
14
Survey locations
9

Individual EA measurements

Largest measured stone loach

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
10.6 cm23 Aug 2013Clodock138242
10.2 cm23 Aug 2013Clodock138242
10 cm23 Aug 2013Clodock138242
5.1 cm23 Aug 2013Clodock138242
5 cm23 Aug 2013Clodock138242
4.9 cm23 Aug 2013Clodock138242
4.6 cm23 Aug 2013Clodock138242
4.6 cm23 Aug 2013Clodock138242
4.4 cm23 Aug 2013Clodock138242
4.4 cm23 Aug 2013Clodock138242

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where stone loach were found

Each point marks a survey location with at least one stone loach 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 stone loach
Clodock11 Jul 19895 Aug 20258
Llanveynoe22 Aug 199522 Jul 20082
W059J30 Sept 200216 Sept 20032
W059H21 Sept 200016 Sept 20033
W059G21 Sept 200016 Sept 20033
W059F22 Sept 200016 Sept 20033
W098r8 Sept 19998 Sept 19991
W098p30 Jul 199730 Jul 19971
W05511 Jul 198911 Jul 19891

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

1989–2025

Survey records by year

Each bar shows how many survey visits recorded stone loach that year.

Fish measured by surveyors

Measured length distribution

See how the 14 measured fish were spread across different length ranges.

Smallest
2.7 cm
Lower quarter
4.1 cm
Median
4.6 cm
Upper quarter
5.1 cm
Largest
10.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Monnow

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

Brown / sea trout Bullhead European eel Minnow 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 →