Sea urchins are invertebrates belonging to phylum Echinodermata, class Echinodea and are related to sea cucumbers and sea stars.
They are found on most rocky subtidal habitats in British Columbia (BC) from just below the low tide line to 130 metres (426 feet) but are common between 4 - 30 metres (13 - 90 feet). Urchins prefer rocky ground and avoid rocky areas exposed to extreme wave action and areas with sediments such as sand and mud.
The green urchin dive fishery is primarily in southern coastal areas.Harvested primarily for the roe or uni, sea urchin is popular served fresh and uncooked as sushi. It is also used in soups, custards and other seafood dishes as a flavour enhancer.