RiverFish

Stone loach · Barbatula barbatula

Stone loach in the Main River Coly

Largest measured stone loach: 12.9 cm

The largest stone loach measured in Environment Agency surveys of the Main River Coly was 12.9 cm, recorded at Upstream Colyford (Sp) on 15 June 2021.

Across 161 measured stone loach, the median measured length was 8.1 cm.

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 Coly.

See stone loach records across England →

Most recent observation11 July 2025Upstream Cadhayne (Te) · 3 fish
Largest measured stone loach
12.9 cm
Median length
8.1 cm
Fish measured
161
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
12.9 cm15 Jun 2021Upstream Colyford (Sp)159924
12.1 cm16 May 2022Upstream Colyford (Sp)160944
11.9 cm15 Jun 2021Upstream Colyford (Sp)159924
11.9 cm15 Jun 2021Upstream Colyford (Sp)159924
11.4 cm16 May 2022Upstream Colyford (Sp)160944
11.4 cm22 Jun 2016Upstream Colyford (Sp)148409
11.3 cm22 Jun 2016Upstream Colyford (Sp)148409
11.1 cm16 May 2022Upstream Colyford (Sp)160944
11.1 cm16 May 2022Upstream Colyford (Sp)160944
11.1 cm9 Jun 2021Woodbridge (Sp)159877

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
Upstream Cadhayne (Te)7 Jul 201611 Jul 20257
Downstream FT BR Cadhayne (5 min)30 Jun 202330 May 20242
Upstream Chantry Bridge (5 min)30 Jun 202324 May 20242
Colemans Cross (5 min)28 Jun 202324 May 20242
Upstream Colyford (Sp)18 Jul 199729 Jun 20238
Upstream Colyford (5 min)29 Jun 202329 Jun 20231
Woodbridge (Sp)18 Jul 199731 May 20238
Upstream Southleigh Str6 May 20206 May 20201
Heathayne (Te)*22 Jul 199727 Jun 201313

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

1997–2025

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 161 measured fish were spread across different length ranges.

Smallest
2.4 cm
Lower quarter
7.2 cm
Median
8.1 cm
Upper quarter
10 cm
Largest
12.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Main River Coly

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

Brown / sea trout Bullhead European eel Minnow Atlantic salmon

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 →