← Rock Pool Directory/ United Kingdom/ Cemlyn Bay

Cemlyn Bay

Ynys Môn / Isle of Anglesey, Cymru / Wales · United Kingdom

What have people found?

European bittersweet clam, blue jelly and channelled wrack turn up here more than at our other rock pools. Atlantic beadlet anemone, knotted wrack and bladder wrack are the usual finds. ~15 distinct species have been recorded here. More has been recorded at Treborth Botanic Garden, 31 kilometers away.

What is the best time to visit today?

Download the app to see the 7-day schedule.

Predicted tide for Cemaes Bay, from The UK Hydrographic Office.

See low tide times at Cemlyn Bay for the next three days
  1. Sun 15 Nov8:002.4 min the dark20:352.2 m
  2. Mon 16 Nov8:482.6 min the dark21:302.4 m
  3. Tue 17 Nov9:492.8 min the dark22:362.5 m

Every low tide each day, in local time at the shore.

Plan the week in Intertidal
  • A tide chart for every day, with the best window marked
  • Identify what you find from a photo
  • An alert when a good daylight low is coming

When do people visit?

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Most observations come from May and September.

What should you know before visiting?

Parking is about 200 meters away.
Arrive 45 minutes to an hour before low tide and leave as it turns. The water comes back faster than it left.
Grippy shoes beat sandals. Wet rock and algae are more slippery than they look. Rock pool safety
A rock pool is a fragile place. Look and photograph, take nothing. The rockpooling code

What lives at Cemlyn Bay?

Species records from iNaturalist

Atlantic Beadlet AnemoneActinia equina
Knotted WrackAscophyllum nodosum
bladder wrackFucus vesiculosus
Channelled WrackPelvetia canaliculata
snakelocks anemoneAnemonia viridis
Edible CrabCancer pagurus
European Green CrabCarcinus maenas
Saw WrackFucus serratus
Common PeriwinkleLittorina littorea
Common European LimpetPatella vulgata
Atlantic DogwhelkNucella lapillus
Velvet Swimming CrabNecora puber
European Bittersweet ClamGlycymeris glycymeris
Lined Top ShellPhorcus lineatus
Blue JellyCyanea lamarckii
Scan this rock pool on your next visit.

Every organism named, every visit logged to your journal.