Olive Upright
- Peak month
- April
- Records since 2000
- 4,445
- Scientific name
- Rhithrogena semicolorata
Blue-winged Olive
- Peak month
- September
- Records since 2000
- 3,275
- Scientific name
- Serratella ignita
Caenis rivulorum
- Peak month
- April
- Records since 2000
- 2,004
- Group
- Mayflies
Alainites muticus
- Peak month
- April
- Records since 2000
- 1,727
- Group
- Mayflies
Green Drake
- Peak month
- May
- Records since 2000
- 1,718
- Scientific name
- Ephemera danica
Large Dark Olive
- Peak month
- April
- Records since 2000
- 1,228
- Scientific name
- Baetis rhodani
Yellow May Dun
- Peak month
- April
- Records since 2000
- 1,186
- Scientific name
- Heptagenia sulphurea
Large Brook Dun
- Peak month
- April
- Records since 2000
- 1,160
- Scientific name
- Ecdyonurus torrentis
Small Dark Olive
- Peak month
- September
- Records since 2000
- 1,117
- Scientific name
- Baetis scambus
Ecdyonurus venosus
- Peak month
- April
- Records since 2000
- 593
- Group
- Mayflies
Pond Olive
- Peak month
- July
- Records since 2000
- 551
- Scientific name
- Cloeon dipterum
Electrogena lateralis
- Peak month
- April
- Records since 2000
- 452
- Group
- Mayflies
Caenis luctuosa
- Peak month
- April
- Records since 2000
- 409
- Group
- Mayflies
Yellow Mayfly
- Peak month
- September
- Records since 2000
- 362
- Scientific name
- Potamanthus luteus
Nigrobaetis niger
- Peak month
- April
- Records since 2000
- 329
- Group
- Mayflies
Ephemera vulgata
- Peak month
- May
- Records since 2000
- 290
- Group
- Mayflies
Habrophlebia fusca
- Peak month
- April
- Records since 2000
- 284
- Group
- Mayflies
Paraleptophlebia submarginata
- Peak month
- April
- Records since 2000
- 273
- Group
- Mayflies
Leptophlebia marginata
- Peak month
- April
- Records since 2000
- 253
- Group
- Mayflies
Leptophlebia vespertina
- Peak month
- April
- Records since 2000
- 233
- Group
- Mayflies
Ecdyonurus dispar
- Peak month
- September
- Records since 2000
- 194
- Group
- Mayflies
Baetis vernus
- Peak month
- September
- Records since 2000
- 153
- Group
- Mayflies
Ephemera lineata
- Peak month
- June
- Records since 2000
- 147
- Group
- Mayflies
Caenis horaria
- Peak month
- March
- Records since 2000
- 113
- Group
- Mayflies
Siphlonurus lacustris
- Peak month
- July
- Records since 2000
- 113
- Group
- Mayflies
Centroptilum luteolum
- Peak month
- April
- Records since 2000
- 108
- Group
- Mayflies
Caenis robusta
- Peak month
- May
- Records since 2000
- 97
- Group
- Mayflies
Caenis pusilla
- Peak month
- April
- Records since 2000
- 68
- Group
- Mayflies
Ephemerella notata
- Peak month
- May
- Records since 2000
- 63
- Group
- Mayflies
Procloeon bifidum
- Peak month
- July
- Records since 2000
- 62
- Group
- Mayflies
Kageronia fuscogrisea
- Peak month
- May
- Records since 2000
- 60
- Group
- Mayflies
Ameletus inopinatus
- Peak month
- May
- Records since 2000
- 58
- Group
- Mayflies
Rhithrogena germanica
- Peak month
- April
- Records since 2000
- 57
- Group
- Mayflies