23. Fishing for research, experimental, and sporting
 purposes---Notwithstanding section 14 or section 19 of this Act, a
 foreign fishing craft may be used for fishing within the exclusive
 economic zone for the purpose of fisheries research or of
 experimentation or sport, subject always to the prior consent in writing
 of the Minister to such activity and in accordance with such conditions
 (if any) as the Minister may impose in giving his consent.