Traceable Species

Green Sea Urchin


Green Sea Urchin

Green sea urchins can be found both the Atlantic and Pacific Oceans. In the Pacific Ocean, they are found from northern Washington State to Alaska, and in the Atlantic Ocean from New Jersey to the Arctic. Green urchins live in rocky substratum of the intertidal zone at depths of 10 m; although they can be found down to 1,200 meters.  They move by using their spines and hundreds of miniature tube 'feet' located under their body, which have tiny suction cups to grip surfaces.

Green sea urchin are the shape of a slightly flattened globe and are covered in short, sharp, movable spines. This species can be pale green, or greenish tinged with purple or brown on their spines. Their mouth is located on the underside of the body and they feed by scraping fine algae off of hard substrate with their teeth. Green sea urchins are generally harvested for their gonads, which are known as "uni" in sushi restaraunts. 

Green Sea Urchin

Sea urchins reproduce in the early spring, when both males and females release their eggs or sperm directly into the water column at the same time to ensure fertilization. Once fertilized, the gamete grows through the process of mitosis and eventually become larvae capable of simple swimming. After a period of time, the larvae swim to the appropriate surface, where they attach, and through a complex metamorphosis process, they form into their adult sea urchin form on the ocean floor.

Food Info Green Sea Urchin


  • Colour: bright orange
  • Texture: firm, grainy, moist
  • Flavour: briny, fresh, sweet
  • Perfect serve: Uni is best served fresh, in the shell. 
Species Range
Green Sea Urchin range Source:
These crabs mate at the time of maturity, which is approximately 3 years of age. Females are smaller than males; this is because the development of reproductive tissues required more energy for females, leaving less energy available for continued body growth. They grow through a process known as molting—regularly shedding their shell and growing a new, larger one. They continue to molt and grow after they have reached sexual maturity. During the breeding season, the crabs leave their borrows in a phenomenon characterized by mass mate-searching events. Once mating/fertilization has occurred, females spawns in the water. The larvae released during the rainy season develop in offshore waters and return to coastal waters five to eight weeks after larval release.
Mangrove crabs are important fishery resources in all Brazilian coast, mainly in the north and northeast where many fishermen depend upon their catch. In addition to its social and economic importance, the mangrove crab is a “keystone” species in ecosystem, they playing an important role in the processes of nutrient cycling and energy transfer.

Fishing Methods

{'fisheries': [<License: Green Sea Urchin by Dive>], 'gear': <Gear: Sea Urchin by Dive>}

Sea Urchin by Dive

Urchins are harvested in shallow sub-tidal areas by SCUBA divers utilizing a hand held rake and net bag for collection.


Featured Harvester Bernie Berry

Mangrove Crab Harvester

Canavieiras, Brazil

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