Rainbow trout · Oncorhynchus mykiss

Rainbow trout in the River Darent

Largest measured rainbow trout: 46 cm

The largest rainbow trout measured in Environment Agency surveys of the River Darent was 46 cm, recorded at Twitton Brook on 5 October 2011.

Across 161 measured rainbow trout, the median measured length was 35.9 cm.

Surveyors recorded weights for 16 rainbow trout. The median was 1 lb 0.5 oz (0.469 kg) and the largest recorded weight was 1 lb 3.6 oz (0.556 kg).

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

See rainbow trout records across England →

Most recent observation6 June 2024Twitton Brook · 2 fish

Largest measured rainbow trout: 46 cm
Median length: 35.9 cm
Fish measured: 161
Survey locations: 3

Individual EA measurements

Largest measured rainbow trout

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
46 cm	5 Oct 2011	Twitton Brook	128592
45 cm	5 Oct 2011	Twitton Brook	128592
44.2 cm	20 Apr 2022	Lullingstone	160908
43.7 cm	30 May 2024	Lullingstone	165052
43.2 cm	5 Oct 2011	Twitton Brook	128592
43 cm	12 Oct 2010	Twitton Brook	125145
42.8 cm	3 Oct 2013	Twitton Brook	139101
42.4 cm	5 Oct 2011	Twitton Brook	128592
42 cm	12 Oct 2010	Twitton Brook	125145
42 cm	18 Jun 2007	Twitton Brook	105714

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

Explore the river

Where rainbow trout were found

Each point marks a survey location with at least one rainbow 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 surveyed	First recorded	Last recorded	Visits finding rainbow trout
Twitton Brook	31 Jul 2006	6 Jun 2024	11
Lullingstone	28 Aug 2009	30 May 2024	6
Preston Farm	4 Sept 2002	25 Aug 2005	4

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

2002–2024

Survey records by year

Each bar shows how many survey visits recorded rainbow trout that year.

102

103

104

105

106

107

108

209

110

211

012

113

014

115

016

217

018

119

020

021

222

023

224

Fish measured by surveyors

Measured length distribution

See how the 161 measured fish were spread across different length ranges.

Smallest: 10.6 cm
Lower quarter: 34.2 cm
Median: 35.9 cm
Upper quarter: 38.5 cm
Largest: 46 cm

100–199 mm

300–399 mm

134

400–499 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 16 rainbow trout. This is a subset of the measured fish and may not represent the whole population.

Lightest: 12.6 oz (0.358 kg)
Lower quarter: 15.2 oz (0.4312 kg)
Median: 1 lb 0.5 oz (0.469 kg)
Upper quarter: 1 lb 1.8 oz (0.504 kg)
Heaviest: 1 lb 3.6 oz (0.556 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Darent

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

Gudgeon Bullhead Roach Perch Brown / sea trout Stone loach

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 →