0 the time when the sea has reached its lowest level --
1 the time when the ocean reaches its lowest level --
The water is described as moving towards the north (up/in) at high tide, and towards the south (down/out) at low tide, approximately every 12 hours.
The peak high and low tide each day exhibit the strongest currents in a diurnal cycle, but the monthly lunar cycle is of greater importance for sea ice travel.
Aquatic birds catch and eat shellfish at low tide.
On the bar at the entrance there are seven feet of water at the highest tide and only about a foot at low tide.
They spent the next three hours on the beach, taking advantage of the low tide to collect molluscs and small marine creatures.
Furthermore, shedding of cercariae is restricted to night-time at low tide.
The greatest numbers of birds were seen about low tide.
The designated area comprises the entire island, with the boundary defined as the low tide level.
