Ezoic horse manure sea urchins are native to Hokkaido and the coast north of Japan, in 1989, Dalian College of Fisheries (now Dalian Ocean University) Department of Aquaculture was introduced to Japan, and after seven years of research, it mastered the technology of indoor artificial nursery and sea raising into commercial urchins.

As for the place of origin, both Hokkaido and Dalian produce good sea urchins such as Ezo sea urchins and northern purple sea urchins. The most important principle of selection is, of course, to be fresh!

When you eat sea urchin at a Japanese restaurant, if the urchin is in a relatively intact shape then it is quite fresh. If it looks like it's melted into a puddle of egg yolk, then blackface please.

When picking a live sea urchin in its shell, if the spines move around more the fresher it is, and if you touch its mouth with a screwdriver, a fresh sea urchin will contract quickly.

Horse dung sea urchin shell solid, hemispherical, 30 to 40 millimeters in diameter, up to 60 millimeters. The antipodal surface is low and slightly elevated, and the mouth is flat. Step zone and inter-step zone width is equal, but the degree of expansion of the inter-step zone is slightly higher than the step zone, so the shell shape from the mouth surface viewed as close to the round smooth pentagonal.