Japanese angelshark is eaten and the rough skin is made into a type of leather called shagreen for use in wood finishing. Angel sharks in general are highly threatened by commercial trawl fisheries due to their susceptibility to capture and low rate of reproduction, and angel shark species elsewhere are known to have declined markedly under fishing pressure. Trawling activity in the Yellow Sea and other parts of the northwestern Pacific is intense and, coupled with pollution, has had a serious impact on the local ecosystem. The Japanese angelshark population is suspected to have declined by up to 50% or more under
The Shagreen Bone the "Wild Ass's Skin" turned into a "Bone"? One can answer like this, for example: how many years have passed "since then"? Anything that does not decompose ossifies and then petrifies. In the novel Vanière, the gardener of monsieur Raphael de Valanten, examines with surprise a shagreen he found in a well and says: "dry as wood and not greasy at all." Thus, the work illustrates the idea of ossification of any culture, including classical ballet. "The Shagreen Bone" is somehow the "reset" (rejection) of the culture of ballet. Subjected to the laws of ballet and summarizing the results of