Horse dung sea urchin Hemicentrotus pulcherrimus, Japanese: バフンウニ, today's protagonist, is more common. Most of these sea urchins are dark green in color, but there are also off-white and russet. Although the sea urchin is small, sea urchin yellow is usually fuller and darker in color.

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Ezoic Horse Dung Sea Urchin Strongylocentrotus intermedius, Japanese: エゾバフンウニ, belongs to the medium to high quality sea urchin varieties, and the best ones are produced in Hokkaido. This sea urchin is in the same family as the horse dung sea urchin, and is very similar in appearance, with short spines that stick to the surface. The yellow color of the sea urchin has a distinctive orange-reddish color, and it is large and thick, with a distinctive grainy surface and a high degree of sweetness.

Light spiny ball sea urchin Strongylocentrotus nudus, also known as the middle ball sea urchin, purple sea urchins, production areas, Hokkaido production of purple sea urchins of better quality, China's Dalian also have more breeding. The skin is purple-black or dark brown, characterized by long spines, often seen in the intertidal zone, a snorkeler's nightmare. The color of sea urchin yellow changes slightly with the season, the overall color is orange, the taste is refreshing, sweetness is not high.

The red sea urchin Strongylocentrotus franciscanus, also known as the red sea urchin, is not very abundant. This sea urchin is smaller and has a distinctive deep red color with shorter spines than the purple sea urchin. The yellow color of the sea urchin is lighter, pale yellow, thin and flat, but the taste is rich and sweet.

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