The direction of water flow changes during the course of the day, due to the differing times of highest and lowest tides at either end. The sheltered waters of the Menai Strait provide excellent conditions for growth of marine algae such as Laminaria saccharina and L. digitata , both of which achieve unusually large sizes in these waters. Species of Fucus, Pelvetia and Ascophyllum also occur here. Sheltered rocky areas provide homes for various barnacles, marine snails, and other molluscs, while mussel beds occur in some of the flatter areas. A variety of fish occur in the waters of the straits, including bass, cod, whiting, conger eels and plaice.
Lobsters also occur, as do sponges and sea anemones.
The visitor to the island can get a closer look of some of these creatures at the Anglesey Sea Zoo , located on the shores of the strait near Brynsiencyn. You can find the Menai Strait with this map . Warren Kovach, Anglesey, Wales. All Rights Reserved.