1 . FISHERIES - WATERS WITHIN THE JURISDICTION OF MEMBER STATES - EQUAL CONDITIONS OF ACCESS FOR FISHERMEN FROM THE COMMUNITY - DEROGATION - PERIOD LAID DOWN BY ARTICLE 100 OF THE ACT OF ACCESSION - EXPIRY - POWERS OF THE COMMUNITY - FAILURE TO EXERCISE POWERS - EXTENSION OF THE DEROGATION BY THE MEMBER STATES - NOT PERMISSIBLE ( ACT OF ACCESSION , ARTS 100 AND 103 ; COUNCIL REGULATION NO 101/76 , ART . 2 ( 1 ); COUNCIL REGULATION NO 170/83 , ART . 6 ( 1 )) 2 . FISHERIES - CONSERVATION OF THE RESOURCES OF THE SEA - POWERS OF THE MEMBER STATES - PROVISIONAL CONSERVATION MEASURES - LIMITS - PROHIBITION OF ACCESS TO NATIONAL WATERS - NOT PERMISSIBLE 3 . COMMUNITY LAW - GENERAL PRINCIPLES OF LAW - NON-RETROACTIVITY OF PENAL PROVISIONS - OBSERVANCE ENSURED BY THE COURT - RETROACTIVITY OF REGULATION NO 170/83 - SCOPE - NATIONAL PENAL MEASURES INCOMPATIBLE WITH COMMUNITY LAW - VALIDATION - ABSENCE ( EUROPEAN CONVENTION ON HUMAN RIGHTS , ART . 7 ; ACT OF ACCESSION , ART . 100 ; COUNCIL REGULATION NO 170/83 , ART . 6 ( 1 ))