RiverFish

Stone loach · Barbatula barbatula

Stone loach in the Main River Tone

Largest measured stone loach: 13 cm

The largest stone loach measured in Environment Agency surveys of the Main River Tone was 13 cm, recorded at Ash Farm (Salmon Project) on 27 May 2010.

Across 366 measured stone loach, the median measured length was 8.1 cm.

Surveyors recorded weights for 17 stone loach. The median was 0.4 oz (0.01 kg) and the largest recorded weight was 0.7 oz (0.021 kg).

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

See stone loach records across England →

Most recent observation30 September 2025Roughmoor (Te)
Largest measured stone loach
13 cm
Median length
8.1 cm
Fish measured
366
Survey locations
16

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
13 cm27 May 2010Ash Farm (Salmon Project)122305
12.2 cm2 Sept 2021Upstream Tracebridge160170
12.2 cm2 Sept 2021Upstream Tracebridge160170
12.2 cm31 Aug 1994Hele Hill79716
12.1 cm3 Jun 2014Greenham (Se-03)140941
12 cm27 May 2010Ash Farm (Salmon Project)122305
12 cm27 May 2010Ash Farm (Salmon Project)122305
12 cm3 Sept 1992Winkleigh80013
11.9 cm2 Sept 2021Upstream Tracebridge160170
11.8 cm20 Aug 2019Roughmoor (Te)155183

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
Roughmoor (Te)9 Oct 200330 Sept 202511
Bathpool1 Sept 200919 Sept 20248
Upstream Tracebridge4 Sept 19922 Sept 20214
Greenham (Se-03)16 Apr 200329 Jul 20214
Newbridge25 Apr 201925 Apr 20191
Ash Farm (Salmon Project)1 Jun 200616 Aug 20188
Bradford on Tone21 May 200818 Jun 20142
Harpford Bridge11 Apr 20003 Jun 20144
Hornshay Farm at Nynehead (Se-03)6 Aug 20017 Jun 20073
Parsonage Farm (Te)22 Sept 20034 Aug 20064
Downstream Nynehead Weir (Salmon Project)1 Jun 20061 Jun 20061
Priorswood (Te)11 Sept 20034 Aug 20042
Incline Cottages8 Sept 19948 Sept 19941
Trefusis Farm1 Sept 19941 Sept 19941
Hele Hill31 Aug 199431 Aug 19941
Winkleigh3 Sept 19923 Sept 19921

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

1992–2025

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 366 measured fish were spread across different length ranges.

Smallest
3.4 cm
Lower quarter
6.5 cm
Median
8.1 cm
Upper quarter
9.7 cm
Largest
13 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 17 stone loach. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.003 kg)
Lower quarter
0.2 oz (0.007 kg)
Median
0.4 oz (0.01 kg)
Upper quarter
0.4 oz (0.011 kg)
Heaviest
0.7 oz (0.021 kg)

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

More fish in this river

Explore the Main River Tone

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

Brown / sea trout Bullhead European eel Minnow Atlantic salmon 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 →