RiverFish

Stone loach · Barbatula barbatula

Stone loach in the River Main Inny

Largest measured stone loach: 12.6 cm

The largest stone loach measured in Environment Agency surveys of the River Main Inny was 12.6 cm, recorded at Trewinnow on 12 August 2025.

Across 188 measured stone loach, the median measured length was 7.5 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 Inny.

See stone loach records across England →

Most recent observation21 August 2025U/s Davidstow Creamery Discharge · 9 fish
Largest measured stone loach
12.6 cm
Median length
7.5 cm
Fish measured
188
Survey locations
18

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
12.6 cm12 Aug 2025Trewinnow179133
11.9 cm15 Sept 2021Treglasta160425
11.6 cm28 Jul 2015Trewinnow145712
11.3 cm13 Aug 2025St. Clether179036
11.2 cm12 Aug 2025Trewinnow179133
11.2 cm15 Sept 2021Treglasta160425
11.1 cm24 Sept 2021Trewinnow160424
11 cm20 Aug 2015St. Clether146033
10.9 cm11 Oct 2018Trewinnow154322
10.9 cm28 Jul 2015Trewinnow145712

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
U/s Davidstow Creamery Discharge11 Aug 202121 Aug 20252
St. Clether6 Jul 198413 Aug 20258
Trewinnow10 Jul 200312 Aug 20257
Treguddick Mill12 Jun 201222 Jul 20254
Upstream Killabury10 Oct 202310 Oct 20231
Downstream Bealsmill7 Sept 20237 Sept 20231
Knightsmill29 Jun 198429 Jun 20236
Trecarrell2 Jul 198422 Sept 20218
Treglasta27 Jul 198415 Sept 20213
Bealsmill26 Jun 198426 Aug 20219
Larrick28 Jul 202128 Jul 20211
u/s Laneast Bridge5 Jul 19842 Jul 20154
Treguddick3 Jul 198412 Sept 200711
Inny Foot26 Jun 198415 Jul 20036
Trewen6 Jul 19849 Jul 20035
Trekenner Mill2 Jul 198430 Jul 19994
Hicks Mill3 Jul 19842 Jul 19963
Killabury29 Jun 198429 Jun 19841

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

1984–2025

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 188 measured fish were spread across different length ranges.

Smallest
2.1 cm
Lower quarter
5.6 cm
Median
7.5 cm
Upper quarter
9.4 cm
Largest
12.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Inny

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

Atlantic salmon 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 →