Site 7a: Concrete Sluice

Migration has always had an aura of mystery about it: how could it not seem supernatural when journeys of such an extent and such a precision are repeatedly accomplished despite many hazardous obstacles.

Dr. Robin Baker - The Mystery of Migration


At low tide, the rocky bottom of the concrete sluice makes ideal environment for crabs and barnacles. The rush of water in and out of the channel between tides attracts organisms that prefer rushing water. Here, red beard sponge, breadcrumb sponge, and even small anemones have been spotted at low tide.

At high tides, schools of Atlantic Silversides and other schooling fish have been seen swimming in and out of the swimming pond. They may used this protected area a shelter against larger feeding fish species or birds that come to feed on the schools of juvenile fish in the areas.