Norway lobster
- Peak month
- March
- Records since 2000
- 63,029
- Scientific name
- Nephrops norvegicus
Northern River Crangonyctid
- Peak month
- October
- Records since 2000
- 44,412
- Scientific name
- Crangonyx pseudogracilis
Edible Crab
- Peak month
- August
- Records since 2000
- 36,315
- Scientific name
- Cancer pagurus
Velvet Swimming Crab
- Peak month
- July
- Records since 2000
- 22,671
- Scientific name
- Necora puber
Hermit Crab
- Peak month
- August
- Records since 2000
- 15,388
- Scientific name
- Pagurus bernhardus
European green crab, Shore Crab
- Peak month
- June
- Records since 2000
- 13,886
- Scientific name
- Carcinus maenas
Atlantic spider crab
- Peak month
- September
- Records since 2000
- 11,797
- Scientific name
- Maja brachydactyla
Calanus helgolandicus
- Peak month
- September
- Records since 2000
- 11,552
- Group
- Crustaceans
Common Spider Crab
- Peak month
- March
- Records since 2000
- 11,388
- Scientific name
- Maja squinado
Long-clawed Porcelain Crab
- Peak month
- August
- Records since 2000
- 9,663
- Scientific name
- Pisidia longicornis
Signal Crayfish
- Peak month
- September
- Records since 2000
- 9,579
- Scientific name
- Pacifastacus leniusculus
Common Lobster
- Peak month
- August
- Records since 2000
- 8,627
- Scientific name
- Homarus gammarus
Ampelisca tenuicornis
- Peak month
- May
- Records since 2000
- 8,453
- Group
- Crustaceans
An acorn barnacle
- Peak month
- June
- Records since 2000
- 7,641
- Scientific name
- Balanus crenatus
Acorn Barnacle
- Peak month
- August
- Records since 2000
- 7,241
- Scientific name
- Semibalanus balanoides
Centropages typicus
- Peak month
- September
- Records since 2000
- 7,143
- Group
- Crustaceans
Harbour Crab
- Peak month
- August
- Records since 2000
- 7,062
- Scientific name
- Liocarcinus depurator
Ampelisca spinipes
- Peak month
- August
- Records since 2000
- 6,948
- Group
- Crustaceans
Galathea intermedia
- Peak month
- August
- Records since 2000
- 6,937
- Group
- Crustaceans
Temora longicornis
- Peak month
- September
- Records since 2000
- 6,752
- Group
- Crustaceans
Common Rough Woodlouse
- Peak month
- April
- Records since 2000
- 6,413
- Scientific name
- Porcellio scaber
Squat Lobster
- Peak month
- June
- Records since 2000
- 6,374
- Scientific name
- Munida rugosa
Urothoe elegans
- Peak month
- June
- Records since 2000
- 6,137
- Group
- Crustaceans
Sand digger shrimp
- Peak month
- April
- Records since 2000
- 5,027
- Scientific name
- Bathyporeia elegans
Common Shiny Woodlouse
- Peak month
- April
- Records since 2000
- 4,917
- Scientific name
- Oniscus asellus
Pariambus typicus
- Peak month
- June
- Records since 2000
- 4,881
- Group
- Crustaceans
Calanus finmarchicus
- Peak month
- May
- Records since 2000
- 4,742
- Group
- Crustaceans
Perioculodes longimanus
- Peak month
- April
- Records since 2000
- 4,698
- Group
- Crustaceans
Harpinia antennaria
- Peak month
- May
- Records since 2000
- 4,695
- Group
- Crustaceans
Freshwater White-clawed Crayfish
- Peak month
- September
- Records since 2000
- 4,536
- Scientific name
- Austropotamobius pallipes
Othomaera othonis
- Peak month
- August
- Records since 2000
- 4,405
- Group
- Crustaceans
Nototropis vedlomensis
- Peak month
- August
- Records since 2000
- 4,293
- Group
- Crustaceans
Wart Barnacle
- Peak month
- August
- Records since 2000
- 4,206
- Scientific name
- Verruca stroemia
Eudorella truncatula
- Peak month
- May
- Records since 2000
- 4,065
- Group
- Crustaceans
Photis longicaudata
- Peak month
- September
- Records since 2000
- 4,033
- Group
- Crustaceans
Tanaopsis graciloides
- Peak month
- May
- Records since 2000
- 4,001
- Group
- Crustaceans
Norway king crab
- Peak month
- August
- Records since 2000
- 3,906
- Scientific name
- Lithodes maja
Ampelisca brevicornis
- Peak month
- September
- Records since 2000
- 3,740
- Group
- Crustaceans
Ampelisca diadema
- Peak month
- September
- Records since 2000
- 3,658
- Group
- Crustaceans
Metridia lucens
- Peak month
- November
- Records since 2000
- 3,549
- Group
- Crustaceans
Flying Crab
- Peak month
- August
- Records since 2000
- 3,505
- Scientific name
- Liocarcinus holsatus
Masked Crab
- Peak month
- July
- Records since 2000
- 3,495
- Scientific name
- Corystes cassivelaunus
Montagu's Stellate Barnacle
- Peak month
- September
- Records since 2000
- 3,299
- Scientific name
- Chthamalus montagui
Water hog lice/slaters
- Peak month
- September
- Records since 2000
- 3,172
- Scientific name
- Asellus aquaticus
Ampelisca typica
- Peak month
- September
- Records since 2000
- 3,168
- Group
- Crustaceans
Bodotria scorpioides
- Peak month
- July
- Records since 2000
- 3,140
- Group
- Crustaceans
Least skeleton shrimp
- Peak month
- September
- Records since 2000
- 3,129
- Scientific name
- Phtisica marina
Caspian mud shrimp
- Peak month
- May
- Records since 2000
- 3,122
- Scientific name
- Chelicorophium curvispinum