Stone loach · Barbatula barbatula

Stone loach in the Turkey Brook

Largest measured stone loach: 12.8 cm

The largest stone loach measured in Environment Agency surveys of the Turkey Brook was 12.8 cm, recorded at Forty Hall on 8 April 2015.

Across 756 measured stone loach, the median measured length was 7.1 cm.

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

See stone loach records across England →

Most recent observation30 June 2026Forty Hall

Largest measured stone loach: 12.8 cm
Median length: 7.1 cm
Fish measured: 756
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
12.8 cm	8 Apr 2015	Forty Hall	144536
12.3 cm	8 Apr 2015	Forty Hall	144536
12.3 cm	29 Sept 2014	Forty Hall	143178
11.9 cm	29 Sept 2014	Forty Hall	143178
11.7 cm	8 Apr 2015	d/s Cuffley Brook confluence	144537
11.4 cm	16 Apr 2014	Forty Hall	140665
11.3 cm	16 Apr 2014	Forty Hall	140665
11.3 cm	4 Apr 2014	Albany Park	140631
11 cm	16 Apr 2014	d/s Cuffley Brook confluence	140666
11 cm	4 Apr 2014	Albany Park	140631

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
Forty Hall	4 May 2006	30 Jun 2026	9
Whitewebbs Golf Course	13 Dec 2013	21 Oct 2019	5
Albany Park	4 Dec 2013	21 Oct 2019	5
12th T at Golf Club	16 May 2006	31 Oct 2018	3
Upstream Albany Park	9 Oct 2017	9 Oct 2017	1
d/s Cuffley Brook confluence	16 Apr 2014	5 Oct 2015	4
Rotenone neutralisation zone 2	27 Nov 2013	27 Nov 2013	1
Rotenone neutralisation zone	27 Nov 2013	27 Nov 2013	1
Forty Hall TMG	26 Mar 2009	20 Apr 2010	2

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

2006–2026

Survey records by year

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

206

007

008

109

110

011

212

513

814

515

016

217

218

219

020

021

022

023

024

025

126

Fish measured by surveyors

Measured length distribution

See how the 756 measured fish were spread across different length ranges.

Smallest: 2.2 cm
Lower quarter: 6.3 cm
Median: 7.1 cm
Upper quarter: 8.5 cm
Largest: 12.8 cm

0–99 mm

716

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Turkey Brook

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

Minnow Roach 3-spined stickleback Bullhead Gudgeon European eel

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 →