We get a 40ft tidal movement here in Jersey. In some areas of the beach at low tide, that uncovers quite a lot of shellfish.

(oysters, mussels, cockles, winkles, limpets, razorfish.......)

The tide takes a little over 6 hours to rise and then 6 hours or so to fall.

These photos were taken at St.Aubin's beach about an hour before low tide.