Sugar Kelp
- Peak month
- January
- Records since 2000
- 20,817
- Scientific name
- Saccharina latissima
Toothed Wrack
- Peak month
- July
- Records since 2000
- 12,824
- Scientific name
- Fucus serratus
Bladder Wrack
- Peak month
- August
- Records since 2000
- 12,111
- Scientific name
- Fucus vesiculosus
Tangle
- Peak month
- August
- Records since 2000
- 8,635
- Scientific name
- Laminaria hyperborea
Forked ribbons
- Peak month
- January
- Records since 2000
- 8,016
- Scientific name
- Dictyota dichotoma
Coral Weed
- Peak month
- May
- Records since 2000
- 7,820
- Scientific name
- Corallina officinalis
Sea Beech
- Peak month
- June
- Records since 2000
- 5,987
- Scientific name
- Delesseria sanguinea
Carrageen
- Peak month
- September
- Records since 2000
- 5,647
- Scientific name
- Chondrus crispus
Paralia sulcata
- Peak month
- April
- Records since 2000
- 5,434
- Group
- Seaweeds and algae
Sea Lettuce
- Peak month
- January
- Records since 2000
- 5,372
- Scientific name
- Ulva lactuca
Achnanthes minutissima
- Peak month
- September
- Records since 2000
- 4,527
- Group
- Seaweeds and algae
Sea Lace
- Peak month
- January
- Records since 2000
- 4,500
- Scientific name
- Chorda filum
Sea Comb
- Peak month
- August
- Records since 2000
- 4,418
- Scientific name
- Plocamium cartilagineum
Knotted Wrack
- Peak month
- August
- Records since 2000
- 4,248
- Scientific name
- Ascophyllum nodosum
Heterosiphonia plumosa
- Peak month
- August
- Records since 2000
- 3,551
- Group
- Seaweeds and algae
Oarweed
- Peak month
- September
- Records since 2000
- 3,533
- Scientific name
- Laminaria digitata
Dulse
- Peak month
- September
- Records since 2000
- 3,467
- Scientific name
- Palmaria palmata
Eyelash Weed
- Peak month
- August
- Records since 2000
- 3,455
- Scientific name
- Calliblepharis ciliata
Red Rags
- Peak month
- August
- Records since 2000
- 3,381
- Scientific name
- Dilsea carnosa
Wireweed, Japweed, Strangleweed
- Peak month
- June
- Records since 2000
- 3,356
- Scientific name
- Sargassum muticum
Navicula gregaria
- Peak month
- September
- Records since 2000
- 3,118
- Group
- Seaweeds and algae
Sea Oak
- Peak month
- September
- Records since 2000
- 3,085
- Scientific name
- Halidrys siliquosa
Spiral Wrack
- Peak month
- September
- Records since 2000
- 3,016
- Scientific name
- Fucus spiralis
Gomphonema parvulum
- Peak month
- September
- Records since 2000
- 2,885
- Group
- Seaweeds and algae
Reimeria sinuata
- Peak month
- September
- Records since 2000
- 2,874
- Group
- Seaweeds and algae
Cryptopleura ramosa
- Peak month
- August
- Records since 2000
- 2,828
- Group
- Seaweeds and algae
Navicula lanceolata
- Peak month
- April
- Records since 2000
- 2,789
- Group
- Seaweeds and algae
Cocconeis placentula
- Peak month
- September
- Records since 2000
- 2,767
- Group
- Seaweeds and algae
Polyides rotunda
- Peak month
- January
- Records since 2000
- 2,740
- Group
- Seaweeds and algae
Channelled Wrack
- Peak month
- September
- Records since 2000
- 2,729
- Scientific name
- Pelvetia canaliculata
Cladophora rupestris
- Peak month
- August
- Records since 2000
- 2,725
- Group
- Seaweeds and algae
Common Maërl
- Peak month
- September
- Records since 2000
- 2,671
- Scientific name
- Phymatolithon calcareum
Amphora pediculus
- Peak month
- September
- Records since 2000
- 2,661
- Group
- Seaweeds and algae
Furbelows
- Peak month
- August
- Records since 2000
- 2,637
- Scientific name
- Saccorhiza polyschides
Proboscia alata
- Peak month
- July
- Records since 2000
- 2,592
- Group
- Seaweeds and algae
False Irish Moss
- Peak month
- August
- Records since 2000
- 2,553
- Scientific name
- Mastocarpus stellatus
Rhizosolenia imbricata
- Peak month
- May
- Records since 2000
- 2,309
- Group
- Seaweeds and algae
Synedra dissipata
- Peak month
- September
- Records since 2000
- 2,300
- Group
- Seaweeds and algae
Thalassionema nitzschioides
- Peak month
- April
- Records since 2000
- 2,297
- Group
- Seaweeds and algae
Pepper Dulse
- Peak month
- September
- Records since 2000
- 2,286
- Scientific name
- Osmundea pinnatifida
Dabberlocks
- Peak month
- June
- Records since 2000
- 2,258
- Scientific name
- Alaria esculenta
Nitzschia palea
- Peak month
- September
- Records since 2000
- 2,250
- Group
- Seaweeds and algae
Achnanthes oblongella
- Peak month
- September
- Records since 2000
- 2,248
- Group
- Seaweeds and algae
Planothidium lanceolatum
- Peak month
- September
- Records since 2000
- 2,245
- Group
- Seaweeds and algae
Exilaria vaucheriae
- Peak month
- April
- Records since 2000
- 2,228
- Group
- Seaweeds and algae
Cocconeis euglypta
- Peak month
- September
- Records since 2000
- 2,218
- Group
- Seaweeds and algae
Gomphonema intricatum
- Peak month
- September
- Records since 2000
- 2,121
- Group
- Seaweeds and algae
Planothidium frequentissimum
- Peak month
- September
- Records since 2000
- 2,083
- Group
- Seaweeds and algae