Project Description

During a dive at Henderson Point I saw this crenate barnacle (Balanus crenatus) cluster with individuals quickly moving their basket-like limbs (cirri) gathering plankton in the current.

I’d like to thank Gregory Jensen for identifying this barnacle and offering the following comment:

“I think the clusters are Balanus crenatus. One of the problems with barnacles is that their shape can be radically altered when they are overcrowded …”

The crenate barnacle is white with a smooth surface.  It likes to attach to smooth objects like old bottles, rounded rocks, or shells.  This barnacle can grow to 0.8 inches (2 cm) with a range that includes Japan, northern Alaska to southern California, and also can be found in the North Atlantic.