Barnacles on rock by David North 1/2
Barnacles by Rob Spray 2/2

Common Barnacle Balanus perforatus

These sessile crustaceans live in big populations along the shoreline and have hard conical shells. They can be seen all year round, particularly along the Norfolk coast.

Conservation status

Barnacles are not presently threatened.

Details

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Barnacles are hermaphrodites but at mating time take on the role of either male or female. The female stores the eggs until they hatch and are released as free swimming larvae known as nauplii which form part of the plankton population. After several moults the larvae fixes itself head first to a rock and metamorphoses into the adult form.

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