RiverFish

Stone loach · Barbatula barbatula

Stone loach in the River Medway

Largest measured stone loach: 14.5 cm

The largest stone loach measured in Environment Agency surveys of the River Medway was 14.5 cm, recorded at D/s Weirwood Reservoir on 14 May 2007.

Across 434 measured stone loach, the median measured length was 8 cm.

Surveyors recorded weights for 11 stone loach. The median was 0.4 oz (0.01 kg) and the largest recorded weight was 0.5 oz (0.015 kg).

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

See stone loach records across England →

Most recent observation23 October 2025Hartfield · 3 fish
Largest measured stone loach
14.5 cm
Median length
8 cm
Fish measured
434
Survey locations
14

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
14.5 cm14 May 2007D/s Weirwood Reservoir105853
13.5 cm14 May 2007D/s Weirwood Reservoir105853
13 cm24 Aug 2017Hartfield151310
13 cm15 Aug 2012Hartfield132882
13 cm25 Jun 2009D/s Weirwood Reservoir119560
12.8 cm29 Sept 2022Fordcombe161899
12.8 cm25 Aug 2016Ashdown House Farm149135
12.5 cm12 May 2008D/s Weirwood Reservoir114616
12.5 cm12 May 2008D/s Weirwood Reservoir114616
12.5 cm12 May 2004D/s Weirwood Reservoir80045

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
Hartfield23 Aug 200123 Oct 202519
Penshurst22 Nov 200116 Oct 202518
Fordcombe14 Nov 200115 Oct 202518
D/s Ashurst Road Bridge10 Aug 200418 Sept 20254
Teston25 Aug 202525 Aug 20251
Maidstone Juvenile Fish Seine Netting Survey15 Jun 201828 May 20255
D/s Weirwood Reservoir7 Aug 20029 Aug 20238
Sovereign Way Tonbridge14 Sept 201125 Jul 20232
Tonbridge Juvenile Fish Seine Netting Survey21 Jun 20132 Aug 20193
Ashdown House Farm25 Aug 201625 Aug 20161
Grom/Medway Confluence u/s9 Oct 20079 Oct 20071
Grom/Medway Confluence d/s9 Oct 20079 Oct 20071
Gallypot12 Apr 20043 Oct 20072
Bewleys Weir23 Sept 200219 Sept 20062

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

2001–2025

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 434 measured fish were spread across different length ranges.

Smallest
1.6 cm
Lower quarter
5.3 cm
Median
8 cm
Upper quarter
9.6 cm
Largest
14.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 11 stone loach. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.002 kg)
Lower quarter
0.2 oz (0.006 kg)
Median
0.4 oz (0.01 kg)
Upper quarter
0.4 oz (0.012 kg)
Heaviest
0.5 oz (0.015 kg)

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

More fish in this river

Explore the River Medway

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

Chub Gudgeon Roach Perch Bleak Dace

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 →