An apparatus for applying an electric current to a crustacean comprising: (i) an electrically insulated tank adapted to contain the crustacean; (ii) two electrodes arranged such that the crustacean can be placed between the electrodes; and (iii) means for creating an electrical potential across the electrodes such that in use current flows between the electrodes and through the curstacean such that the crustacean is anaesthetised or killed.