++++ 1 . FISHERIES - COMMON STRUCTURAL POLICY - PROVISIONAL POWERS OF THE MEMBER STATES - RULES OF A MEMBER STATE ON FISHING WITHIN ITS EXCLUSIVE FISHERY LIMITS - COMPOSITION OF THE CREWS OF VESSELS REGISTERED IN THAT STATE - MINIMUM PROPORTION TO BE COMMUNITY NATIONALS - PERMISSIBILITY ( ACT OF ACCESSION, 1972, ARTS 100 AND 102; COUNCIL REGULATION NO 101/76, ARTS 1 AND 2 ( 1 ) AND COUNCIL REGULATION NO 170/83, ART . 6 ) 2 . COMMUNITY LAW - PRINCIPLES - EQUAL TREATMENT - DISCRIMINATION ON GROUNDS OF NATIONALITY - CONCEPT - NATIONAL MEASURES APPLICABLE TO ANY PERSON WITHIN THE JURISDICTION OF A MEMBER STATE - NOT INCLUDED ( EEC TREATY, ART . 7 )