Sea Pork

Overview

Aplidium solidum, commonly known as sea pork or the red ascidian, is a colonial tunicate that forms robust, fleshy sheets or mats on submerged surfaces. This marine organism consists of numerous individual animals, called zooids, embedded together within a common protective matrix. Beachcombers and divers frequently notice its distinct, meaty appearance washed ashore or attached to hard marine structures.

Appearance

This species forms thick, firm, and gelatinous colonies that often present as lumpy slabs or encrusting sheets featuring a rubbery texture. Their coloration typically spans shades of red, pink, or reddish-brown, often marked by the bright red outlines of individual zooids arranged in orderly systems across the surface.

Biology & behavior

Colonies function as filter feeders, drawing water inward through individual oral apertures to strain microscopic food particles before expelling it through shared common cloacal openings. Reproduction occurs during the spring and summer months, with developing larvae brooded internally within the atrial cavities of the colony before being released into the water column. Certain predators, such as specific nudibranch species, graze directly on the soft tissues of these colonies.