Project Description

The Pacific sea peach (Halocynthia aurantium) is a large solitary tunicate that has two uneven siphons, and is easily recognized by divers.  These animals spend most of their lives attached to rocks, and other hard surfaces.  Tunicates are plankton feeders that survive by drawing seawater into one siphon, gleaning nutrients while expelling waste water through the other siphon.  The Pacific sea peach can reach 6 inches (15 cm) in height, with a range that includes Japan, Siberia, as well as northern Alaska to California.