RiverFish

Stone loach · Barbatula barbatula

Stone loach in the River Mimram

Largest measured stone loach: 13.5 cm

The largest stone loach measured in Environment Agency surveys of the River Mimram was 13.5 cm, recorded at Codicote Station 2 on 6 February 2019.

Across 51 measured stone loach, the median measured length was 9.1 cm.

Surveyors recorded weights for 6 stone loach. The median was 0.4 oz (0.01 kg) and the largest recorded weight was 0.6 oz (0.017 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 Mimram.

See stone loach records across England →

Most recent observation7 May 2026Chandlers End, Mill Farm
Largest measured stone loach
13.5 cm
Median length
9.1 cm
Fish measured
51
Survey locations
25

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
13.5 cm6 Feb 2019Codicote Station 2156120
13.3 cm6 Feb 2019Codicote Station 2156120
13 cm27 Feb 2007Codicote restoration u/s104610
12.8 cm6 Feb 2019Codicote Station 2156120
12.7 cm7 Feb 2019Fulling Mill156124
12.7 cm6 Feb 2019Codicote Station 2156120
12.7 cm6 Feb 2019Codicote Station 2156120
12.4 cm6 Feb 2019Codicote Station 2156120
11.5 cm28 Feb 2007Codicote restoration middle fully quant104616
11.2 cm7 Feb 2019Fulling Mill156124

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
Chandlers End, Mill Farm16 Oct 20037 May 20264
Tewin Flyfishers5 Apr 200725 Sept 202515
Singlers Marsh8 Oct 201426 Sept 20242
Codicote restoration middle fully quant28 Feb 200726 Sept 20243
Rose Farm28 Aug 202428 Aug 20241
Panshanger quarry15 Jun 200620 Aug 202417
Upstream Tewin Fly Fishers3 Oct 20233 Oct 20231
Fulling Mill12 Jul 20174 Apr 20235
Codicote Station 110 Aug 202110 Aug 20211
Tewin flyfishers middle3 Oct 201723 Sept 20192
Tewin Archers8 Oct 201523 Sept 20193
Sherrardswood School13 Feb 201913 Feb 20191
Codicote Station 211 Jul 20176 Feb 20192
Duck Trap Wood9 Oct 20149 Oct 20141
Panshanger quarry broadwater bypass channel22 Oct 201021 Sept 20112
Codicote restoration d/s1 Mar 20071 Mar 20071
Codicote restoration middle fixed effort28 Feb 200728 Feb 20071
Codicote restoration u/s27 Feb 200727 Feb 20071
Rye end cottages12 Jul 200612 Jul 20061
Upstream Panshanger weir16 Jun 200616 Jun 20061
Codicote bottom farm14 Jun 200614 Jun 20061
u/s Tewin Bury farm13 Jun 200613 Jun 20061
School/corn mill13 Jun 200613 Jun 20061
Tewin Bury Farm19 Nov 200319 Nov 20031
Cole Green Way Farm14 Oct 200314 Oct 20031

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

2003–2026

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 51 measured fish were spread across different length ranges.

Smallest
2.2 cm
Lower quarter
8.8 cm
Median
9.1 cm
Upper quarter
10.6 cm
Largest
13.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 6 stone loach. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.004 kg)
Lower quarter
0.3 oz (0.008 kg)
Median
0.4 oz (0.01 kg)
Upper quarter
0.5 oz (0.0128 kg)
Heaviest
0.6 oz (0.017 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 Mimram

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

Bullhead Brown / sea trout 3-spined stickleback Minnow 10-spined stickleback 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 →