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 its development, the work demonstrates the absurdity of ballet and its stagnant forms. The composer seems to rise from the orchestra pit and throw bones in the face of the audience, that is to say, ballet clichés: grand pas, fouettés, variations, adagios. Yet the result is a beautiful romantic ballet, showed twice: firstly the ballet as such, with its meaningless joy and conventional character, and secondly with the author's attitude. This was one of the reasons, among others, for changing the title and replacing the "skin" with a "bone." The Shagreen Bone The Shagreen Bone (, ) Op. 37-38 (1990)