fails without reasonable excuse to comply with any requirement imposed by a British sea-fishery officer under the powers conferred on British sea-fishery officers by articles 7, 8 or 9;

without reasonable excuse prevents, or attempts to prevent, any other person from complying with any such requirement; or

assaults an officer, or a person assisting an officer, who is exercising any of the powers conferred on him by article 7,8 or 9 or intentionally obstructs any such officer in the exercise of any of those powers,

on summary conviction to a fine not exceeding the statutory maximum; or

on conviction on indictment to a fine.