RiverFish

3-spined stickleback · Gasterosteus aculeatus

3-spined stickleback in the River Marlow

Largest measured 3-spined stickleback: 4 cm

The largest 3-spined stickleback measured in Environment Agency surveys of the River Marlow was 4 cm, recorded at Marlow Upstream Fry on 17 August 2010.

Across 76 measured 3-spined stickleback, the median measured length was 2.9 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 Marlow.

See 3-spined stickleback records across England →

Most recent observation4 September 2025Marlow Upstream Fry · 2 fish
Largest measured 3-spined stickleback
4 cm
Median length
2.9 cm
Fish measured
76
Survey locations
2

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.

LengthSurvey dateSurvey locationSurvey ID
4 cm17 Aug 2010Marlow Upstream Fry124337
3.8 cm22 Aug 2024Marlow Downstream Fry166480
3.8 cm24 Aug 2017Marlow Upstream Fry151482
3.7 cm22 Aug 2024Marlow Downstream Fry166480
3.6 cm17 Aug 2010Marlow Downstream Fry124336
3.5 cm4 Sept 2025Marlow Downstream Fry178522
3.5 cm22 Aug 2024Marlow Downstream Fry166480
3.5 cm22 Aug 2016Marlow Upstream Fry149225
3.5 cm17 Aug 2010Marlow Downstream Fry124336
3.5 cm18 Aug 2009Marlow Downstream Fry120416

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 surveyedFirst recordedLast recordedVisits finding 3-spined stickleback
Marlow Upstream Fry17 Aug 20104 Sept 20255
Marlow Downstream Fry19 Aug 20084 Sept 20258

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

2008–2025

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 76 measured fish were spread across different length ranges.

Smallest
1.6 cm
Lower quarter
2.5 cm
Median
2.9 cm
Upper quarter
3.2 cm
Largest
4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Marlow

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

Minnow Gudgeon Chub Roach Bleak 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 →