Sea urchin is very delicious and is usually eaten raw with vinegar and mustard. Smooth and tender, it feels very refreshing.

It looks a bit like fish roe, which can be described as "fresh, tender and smooth", similar to steamed eggs.

Sea urchin is a class under the phylum Echinodermata and a type of invertebrate that lives in shallow waters of the ocean. The main characteristics are that the body is spherical, disc-shaped or heart-shaped and has no arms. The endoskeleton fuses with each other to form a strong shell, which can be divided into two subclasses: regular Echinoidea and irregular Echinoidea, 22 orders.

Sea urchins are generally darker in color, such as green, olive, brown, purple and black. There are more than 900 species, classified into 225 genera. About 100 species are known in China, and there are about 7,000 fossil species.

Distributed on the seabed from the intertidal zone to a depth of several thousand meters, mostly concentrated on the rocky seafloor or sandy seafloor in the coastal zone. It may be widely distributed or limited to specific sea areas, depending on species. Varies.

Sea urchin is the earliest model organism used in the history of biological sciences. Its eggs and embryos play a decisive role in the development of early developmental biology. It is one of the longest-lived marine creatures on earth. Most sea urchins like to live on rocks, coral reefs and hard seabeds. They mainly rely on tube feet and spines for movement. Movement is often related to feeding.