The shape of sea cucumber Although sea cucumber is cylindrical, its thickness, shape and size vary greatly among different varieties. Common large edible sea cucumbers are thick and cylindrical, with warty feet on the back and tube feet on the ventral surface, such as sea cucumbers, sea cucumbers, sea cucumbers, sea cucumbers and sea cucumbers.

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Sea cucumbers are distributed in all sea areas of the world, with the most species in the Indo-Western Pacific, especially edible sea cucumbers, which are mostly distributed in tropical coral reefs. There is only one kind of edible sea cucumber in northern China, namely Stichopus japonicus, but there are more than a dozen edible sea cucumbers in Hainan Island and Xisha Islands. Most edible sea cucumbers live in intertidal zone or shallow sea. There are sea cucumbers in the deep sea and even in the abyss. Most of them are flat-footed sea cucumbers.

The most common animal in ten thousand meters deep ditch is sea cucumber. However, deep-sea sea cucumbers are inedible. Edible sea cucumbers mostly inhabit hard stone bottom, coral reef bottom or coral sand bottom. They can crawl slowly on the bottom of the sea, or lurk in the sand, or hide under stones. Sea cucumber has a "summer sleep" phenomenon, and sea cucumber with jade foot has a "hibernation" phenomenon.

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