RiverFish

Brown / sea trout · Salmo trutta

Brown / sea trout in the Croasdale Beck

Largest measured brown / sea trout: 36 cm

The largest brown / sea trout measured in Environment Agency surveys of the Croasdale Beck was 36 cm, recorded at 100M Upstream Bridge on 5 September 2000.

Across 635 measured brown / sea trout, the median measured length was 7.2 cm.

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

See brown / sea trout records across England →

Most recent observation27 August 2025Slaidburn · 6 fish
Largest measured brown / sea trout
36 cm
Median length
7.2 cm
Fish measured
635
Survey locations
9

Individual EA measurements

Largest measured brown / sea trout

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
36 cm5 Sept 2000100M Upstream Bridge90504
26.7 cm1 Sept 2008Slaidburn113693
18 cm27 Aug 2025Slaidburn178100
18 cm5 Sept 2000100M Upstream Bridge90504
18 cm17 Aug 1993Above Croasdale House112875
17.3 cm1 Aug 2005Slaidburn87152
17 cm5 Aug 2022Slaidburn161255
16.9 cm6 Aug 2019Slaidburn155216
16.7 cm17 Sept 2009Slaidburn118973
16.6 cm9 Aug 2013Slaidburn137901

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

Explore the river

Where brown / sea trout were found

Each point marks a survey location with at least one brown / sea trout 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 brown / sea trout
Slaidburn24 Aug 199327 Aug 202522
Shay House17 Aug 199327 Jul 20155
Shay House 25 Sept 20005 Sept 20001
Croasdale ptc Laneshaw Brook27 Sept 19935 Sept 20002
100M Upstream Bridge4 Sept 19985 Sept 20002
Downstream Croasdale House17 Aug 19934 Sept 19982
Croasdale Pages Farm18 Aug 199318 Aug 19931
Croasdale Fell, below quarry17 Aug 199317 Aug 19931
Above Croasdale House17 Aug 199317 Aug 19931

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

1993–2025

Survey records by year

Each bar shows how many survey visits recorded brown / sea trout that year.

Fish measured by surveyors

Measured length distribution

See how the 635 measured fish were spread across different length ranges.

Smallest
4 cm
Lower quarter
6.1 cm
Median
7.2 cm
Upper quarter
11.8 cm
Largest
36 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Croasdale Beck

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

Atlantic salmon 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 →