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Longis Bay

Alderney · Guernsey

What have people found?

Chamaeleon prawn, side-gilled seaslug and wakame turn up here more than at our other rock pools. Blue jelly, green ormer and harpoonweed are the usual finds. ~55 distinct species have been recorded here.

What is the best time to visit today?

Download the app to see the 7-day schedule.

See low tide times at Longis Bay for the next three days
  1. Sun 15 Novin the dark~4:00~16:30
  2. Mon 16 Novin the dark~4:30in the dark~17:30
  3. Tue 17 Novin the dark~5:30in the dark~18:30

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 January and May.

What should you know before visiting?

Parking is about 550 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 Longis Bay?

Species records from iNaturalist

Blue JellyCyanea lamarckii
Green OrmerHaliotis tuberculata
HarpoonweedAsparagopsis armata
Garden SnailCornu aspersum
Chamaeleon PrawnHippolyte varians
Pacific OysterMagallana gigas
European Green CrabCarcinus maenas
WakameUndaria pinnatifida
Side-gilled SeaslugBerthella plumula
Sphaerococcus coronopifoliusSphaerococcus coronopifolius
Common Sea SlaterLigia oceanica
White Italian SnailTheba pisana
Sugar KelpSaccharina latissima
Green Sea UrchinPsammechinus miliaris
Mauve StingerPelagia noctiluca
Scan this rock pool on your next visit.

Every organism named, every visit logged to your journal.