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
Nappa leather was first 'coined' by Emanuel Manasse in 1875 while working for the Sawyer Tanning Company in Napa, California. Nappa tannage in the "strict sense", but a term no longer used in this framework, refers to a tannage consisting of alum salts with vegetable tanning agents. Napa leather is defined in Merriam-Webster's dictionary. Nappa leather Nappa leather is a leather, typically dyed, made from goat-, cow-, calf-, lamb- or other skin by tanning. It is noted for its soft hand. It is a generic term in the leather field and has no distinct test for characterization. Because of this ambiguity, the