Pacific Acorn Barnacle

Balanus glandula

Photo by Rosie Perera on flickr.com

Have you ever seen rocks covered in barnacles along the shoreline on the North Shore? Have you ever scraped your bare foot on walking in a tide pool? It was most likely a patch of Pacific Acorn Barnacles! Although small individually, these white and light grey cone-shaped barnacles cluster together in patches on solid surfaces in inter-tidal areas. Pacific Acorn Barnacles filter feed on plankton. Once stuck to a surface, these barnacles are sessile. This means that they cannot move. Hardened barnacles can be a problem for ships because once barnacles become attached, they are very difficult to remove. They can slow down the ship and use up extra fuel.

Information from E-Fauna BC: https://linnet.geog.ubc.ca/efauna/Atlas/Atlas.aspx?sciname=Balanus%20glandula&ilifeform=106