3-spined stickleback · Gasterosteus aculeatus

3-spined stickleback in the By Brook main river

Largest measured 3-spined stickleback: 5.9 cm

The largest 3-spined stickleback measured in Environment Agency surveys of the By Brook main river was 5.9 cm, recorded at Weavern (Se-03) on 11 October 2018.

Across 218 measured 3-spined stickleback, the median measured length was 3.1 cm.

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

See 3-spined stickleback records across England →

Most recent observation11 October 2018Weavern (Se-03) · 169 fish

Largest measured 3-spined stickleback: 5.9 cm
Median length: 3.1 cm
Fish measured: 218
Survey locations: 7

Individual EA measurements

Largest measured 3-spined stickleback

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
5.9 cm	11 Oct 2018	Weavern (Se-03)	153701
5.8 cm	11 Oct 2018	Weavern (Se-03)	153701
5.5 cm	11 Oct 2018	Weavern (Se-03)	153701
5.4 cm	11 Oct 2018	Weavern (Se-03)	153701
5.2 cm	11 Oct 2018	Weavern (Se-03)	153701
5.2 cm	18 Apr 2013	Gatcombe Mill Brook	135869
5.1 cm	11 Oct 2018	Weavern (Se-03)	153701
5.1 cm	18 Apr 2013	Gatcombe Mill Brook	135869
5.1 cm	18 Apr 2013	Gatcombe Mill Brook	135869
5 cm	11 Oct 2018	Weavern (Se-03)	153701

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where 3-spined stickleback were found

Each point marks a survey location with at least one 3-spined stickleback 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 3-spined stickleback
Weavern (Se-03)	20 Apr 1999	11 Oct 2018	3
Middlehill	9 Oct 2018	9 Oct 2018	1
D/s Bathford Paper mill	12 Sept 2013	12 Sept 2013	1
Gatcombe Mill Brook	18 Apr 2013	18 Apr 2013	1
Slaughterford	15 Apr 1999	19 Jul 2010	2
Castle Combe Golf Course (Se-02)	8 Apr 1999	8 Aug 2002	2
Gatcombe Mill	23 Mar 1999	23 Mar 1999	1

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

1999–2018

Survey records by year

Each bar shows how many survey visits recorded 3-spined stickleback that year.

499

000

001

102

003

004

005

006

007

008

009

210

011

012

213

014

015

016

017

218

Fish measured by surveyors

Measured length distribution

See how the 218 measured fish were spread across different length ranges.

Smallest: 1.6 cm
Lower quarter: 2.6 cm
Median: 3.1 cm
Upper quarter: 3.6 cm
Largest: 5.9 cm

0–99 mm

218

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the By Brook main river

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

Brown / sea trout Bullhead Minnow Stone loach European eel Brook lamprey

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 →