A large, spiny crab caught only around eastern Hokkaido, related to king crab, prized for turning a vivid red when boiled and for its sweet, firm meat.
花咲蟹 is named after 花咲, a cape near Nemuro in eastern Hokkaido, its main fishing ground; like タラバ蟹, it is biologically a hermit-crab relative rather than a true crab.