Why are some shrimp skins soft and some hard? There is not much difference in protein content, but in terms of calcium content, the calcium content of soft shells will be lower. As long as it is because They generally grow faster and the growth time is shorter, so they will be deficient in calcium, resulting in soft shells! The scientific name of "hard-shell shrimp" is red shrimp. The shrimp is a long-bodied shrimp with a thick, rough and downy carapace. It has brown-red irregular oblique spots on the body surface, a short forehead, a pointed end, and fine hairs all over the carapace. It is distributed in Indonesia, Japan, North Korea, and all provinces and regions in the South China Sea and East China Sea in my country. It inhabits sandy and muddy bottom waters with water depths below 220 meters, and lives in intertidal zones to subtidal zones. The barbeled shrimp has 6-8 upper frontal teeth, the distal end is slightly curved upward and almost contacts the end of the first antennal handle. The cephalothorax has a posterior frontal tooth, eye spines, antennal spines, liver spines and branchial spines, and has 12-25 articulators.