3-spined stickleback · Gasterosteus aculeatus

3-spined stickleback in the River Mersey

Largest measured 3-spined stickleback: 4 cm

The largest 3-spined stickleback measured in Environment Agency surveys of the River Mersey was 4 cm, recorded at Mrme10 on 6 August 2003.

Across 6 measured 3-spined stickleback, the median measured length was 3.5 cm.

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

See 3-spined stickleback records across England →

Most recent observation14 July 2006Mrme05 · 14 fish

Largest measured 3-spined stickleback: 4 cm
Median length: 3.5 cm
Fish measured: 6
Survey locations: 6

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
4 cm	6 Aug 2003	Mrme10	76604
4 cm	6 Aug 2003	Mrme10	76604
3.6 cm	6 Aug 2003	Mrme10	76604
3.3 cm	6 Aug 2003	Mrme10	76604
3.2 cm	6 Aug 2003	Mrme10	76604
3 cm	6 Aug 2003	Mrme10	76604

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
Mrme11	14 Jul 2006	14 Jul 2006	1
Mrme05	2 Oct 2003	14 Jul 2006	3
Mrme20	2 Oct 2003	7 Jun 2006	2
Mrme10	6 Aug 2003	6 Aug 2003	1
Mrme15	17 Oct 2002	17 Oct 2002	1
Mrme33	7 May 2000	18 Oct 2000	8

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

2000–2006

Survey records by year

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

800

001

102

303

004

105

306

Fish measured by surveyors

Measured length distribution

See how the 6 measured fish were spread across different length ranges.

Smallest: 3 cm
Lower quarter: 3.2 cm
Median: 3.5 cm
Upper quarter: 3.9 cm
Largest: 4 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Mersey

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

Gudgeon Roach Chub Minnow Perch 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 →