Stone loach · Barbatula barbatula

Stone loach in the River Darent

Largest measured stone loach: 14.5 cm

The largest stone loach measured in Environment Agency surveys of the River Darent was 14.5 cm, recorded at Park Farm on 22 September 2011.

Across 439 measured stone loach, the median measured length was 9.2 cm.

Surveyors recorded weights for 9 stone loach. The median was 0.3 oz (0.008 kg) and the largest recorded weight was 0.4 oz (0.01 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 Darent.

See stone loach records across England →

Most recent observation22 July 2026Twitton Brook · 1 fish

Largest measured stone loach: 14.5 cm
Median length: 9.2 cm
Fish measured: 439
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.

Length	Survey date	Survey location	Survey ID
14.5 cm	22 Sept 2011	Park Farm	128091
13.5 cm	5 Jun 2019	Preston Farm	154577
13.5 cm	23 Apr 2015	Preston Farm	144633
13.2 cm	25 Aug 2005	Preston Farm	86600
13.1 cm	11 May 2017	Preston Farm	150433
13 cm	25 May 2017	Quebec House Car Park Westerham	150439
12.9 cm	11 May 2017	Preston Farm	150433
12.9 cm	2 Aug 2005	Sundridge	87539
12.8 cm	22 Sept 2011	Park Farm	128091
12.8 cm	25 Aug 2005	Preston Farm	86600

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 surveyed	First recorded	Last recorded	Visits finding stone loach
Twitton Brook	19 Aug 2004	22 Jul 2026	7
Preston Farm	4 Sept 2002	11 Jun 2026	16
Sundridge	8 Sept 2003	3 May 2022	6
Quebec House Car Park Westerham	21 Jun 2011	28 Apr 2022	3
Lullingstone	13 Sept 2007	20 Apr 2022	5
Horton Kirby	28 Jul 2006	30 Apr 2019	5
Park Farm	22 Sept 2011	25 May 2017	2
Acacia Hall	28 Aug 2009	28 Aug 2009	1
Westerham	4 Jul 2003	22 Aug 2006	4

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

2002–2026

Survey records by year

Each bar shows how many survey visits recorded stone loach that year.

102

303

404

405

406

107

108

209

110

511

012

413

214

415

016

317

018

219

020

021

422

023

224

025

226

Fish measured by surveyors

Measured length distribution

See how the 439 measured fish were spread across different length ranges.

Smallest: 4 cm
Lower quarter: 7.8 cm
Median: 9.2 cm
Upper quarter: 10.3 cm
Largest: 14.5 cm

0–99 mm

296

100–199 mm

143

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 9 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: 0.3 oz (0.008 kg)
Upper quarter: 0.3 oz (0.008 kg)
Heaviest: 0.4 oz (0.01 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 Darent

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

Gudgeon Bullhead Roach Perch Brown / sea trout Pike

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 →