Put it in the refrigerator to chill. If for a long time, it is recommended to add ice coat, that is, wrapped in ice.

Sea urchin is an order under the phylum Echinodermata, a group of invertebrates that live in the shallow waters of the ocean. The main characteristics of the body is spherical, disk-shaped or heart-shaped, no wrist. The endoskeletons are fused to each other to form a strong shell, and most species have a complex chewing apparatus in the mouth called Aristotle's lantern, which is toothed and can chew food.

The digestive tube is long and tubular, coiled in the body, feeding on algae, hydroids and worms. Multi-dioecious, individual development through the sea urchin larvae (long carapace), and then metamorphosed into young sea urchins, after 1-2 years to reach sexual maturity. It can be divided into two subclasses: the regular sea urchin subclass and the irregular sea urchin subclass, and 22 orders. There are more than 900 species and 225 genera. About 100 species are known in China, and about 7,000 species are fossilized.

References

How to Preserve Fresh Sea Cucumber (Wet Sea Cucumber). Zhihu [cited 2018-1-8]