The haemocyanins of Erimacrus isenbeckii, Paralithodes camtschaticus and Chionoecetes opilio were examined for starch gel electrophoretic patterns in order to contribute to their classification. There were detected 4, 3, and 5 components for E. isenbeckii, p. camtschaticus and C. opilio, respectively. There was no difference between both sexes of E, isenbeckii.