Overview Species Guide Regulations Licenses Fisheries Data

Purple Sea Urchin

Strongylocentrotus purpuratus

Also known as

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About the Purple Sea Urchin

The Purple Sea Urchin is easily identified by its vibrant, deep purple coloration and spherical body, covered in numerous sharp, movable spines. These spines, while protective, also aid in locomotion across the rocky seafloor. Its intricate, radial symmetry is a hallmark of echinoderms, making it a distinctive sight in its marine habitat. Though small, its striking appearance stands out against the backdrop of kelp forests and rocky crevices.

Source: FishBase & iNaturalist

Habitat

This species thrives in the cooler waters of the Pacific, inhabiting both the lower intertidal zone and extending into nearshore subtidal communities. Anglers often encounter them clinging to rocky reefs, kelp holdfasts, and pier pilings where they graze on algae.

Distribution

Its geographic range stretches along the eastern Pacific coastline, from the sunnier shores of Ensenada, Mexico, all the way north to the colder waters off British Columbia, Canada.

Behaviour

Primarily nocturnal grazers, Purple Sea Urchins slowly move across hard substrates, scraping algae and detritus with their five-toothed 'Aristotle's lantern' mouthpart. They play a critical role in controlling algal growth in their ecosystems. Reproduction is most active during January, February, and March, when they broadcast spawn, releasing orange eggs and sperm into the water column.

Edibility

★★★★★

The gonads, known as 'uni' in sushi, are highly prized for their rich, buttery, and slightly sweet flavor. Considered a delicacy by many, they are often eaten raw or lightly prepared.

Lure suggestion

Purple Sea Urchins are not typically targeted by recreational anglers using traditional rod and reel methods or lures. Instead, they are harvested by hand-picking or using specialized rakes and tongs, often while diving or wading in shallow waters, for their edible roe. While not a target for lures, their presence can indicate a healthy reef ecosystem, which in turn attracts game fish that prey on urchins or other reef inhabitants.